diff --git a/src/commands.hxx b/src/commands.hxx
index fe7386d..efa96ee 100644
--- a/src/commands.hxx
+++ b/src/commands.hxx
@@ -98,6 +98,10 @@ class Command: public QObject {
     virtual std::shared_ptr<Command> parse(Script*, QString,
                                            QStringList&, QString, int, int) = 0;
     virtual bool execute(Script*, QWebFrame*) = 0;
+    static void error(Logger& log, const Exception& e) {
+      log(QString("  FAILED: ")+e.what());
+      throw e;
+    }
     void line(int linenr) {
       _line = linenr;
     }
@@ -128,9 +132,9 @@ class Command: public QObject {
     virtual bool isTestcase() {
       return true;
     }
-    static void realMouseClick(QWebFrame* frame, QString selector) {
+    static void realMouseClick(Logger& log, QWebFrame* frame, QString selector) {
       QWebElement element(find(frame, selector));
-      if (element.isNull()) throw ElementNotFound(selector);
+      if (element.isNull()) error(log, ElementNotFound(selector));
       realMouseClick(element);
     }
     static void realMouseClick(const QWebElement& element) {
@@ -168,7 +172,7 @@ class Command: public QObject {
         QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
     }
   protected:
-    bool runScript(Command* parentCommand,
+    bool runScript(Logger& log, Command* parentCommand,
                    std::shared_ptr<Script> script,
                    Script* parent, QWebFrame* frame,
                    QStringList vars = QStringList(),
@@ -299,10 +303,10 @@ class Comment: public Command {
 
 class Screenshot: public Command {
   public:
-    static QString sourceHtml(int line, QString target, QString base,
+    static QString sourceHtml(Logger& log, int line, QString target, QString base,
                               QString name, QWebFrame* frame) {
       if (!QDir(target).exists() && !QDir().mkpath(target))
-        throw DirectoryCannotBeCreated(target);
+        error(log, DirectoryCannotBeCreated(target));
       QCoreApplication::processEvents();
       QString filename(target+QDir::separator()+
                        QString("%4-%1-%2-%3.html")
@@ -313,13 +317,13 @@ class Screenshot: public Command {
                             .toString("yyyyMMddHHmmss")));
       QFile file(filename);
       if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
-        throw CannotWriteSouceHTML(filename);
+        error(log, CannotWriteSouceHTML(filename));
       QTextStream out(&file);
       out<<frame->toHtml();
-      if (out.status()!=QTextStream::Ok) throw CannotWriteSouceHTML(filename);
+      if (out.status()!=QTextStream::Ok) error(log, CannotWriteSouceHTML(filename));
       return QDir(filename).absolutePath();
     }
-    static QString screenshot(int line, QString target, QString base,
+    static QString screenshot(Logger& log, int line, QString target, QString base,
                               QString name, QWebFrame* frame) {
       bool wasShown(frame->page()->view()->isVisible());
       frame->page()->view()->show();
@@ -330,7 +334,7 @@ class Screenshot: public Command {
       painter.end();
       if (!wasShown) frame->page()->view()->hide();
       if (!QDir(target).exists() && !QDir().mkpath(target))
-        throw DirectoryCannotBeCreated(target);
+        error(log, DirectoryCannotBeCreated(target));
       QCoreApplication::processEvents();
       QString filename(target+QDir::separator()+
                        QString("%4-%1-%2-%3.png")
@@ -339,7 +343,7 @@ class Screenshot: public Command {
                        .arg(name)
                        .arg(QDateTime::currentDateTime()
                             .toString("yyyyMMddHHmmss")));
-      if (!image.save(filename)) throw CannotWriteScreenshot(filename);
+      if (!image.save(filename)) error(log, CannotWriteScreenshot(filename));
       return QDir(filename).absolutePath();
     }
     QString tag() const {
@@ -639,8 +643,9 @@ class Script: public QObject {
               // timeout may happen during load due to bad internet connection
               if (screenshots)
                 try { // take a screenshot on error
+                  Logger log(0, this);
                   QString filename(Screenshot::screenshot
-                                   ((*cmd)->line(), targetdir(),
+                                   (log, (*cmd)->line(), targetdir(),
                                     _testclass,
                                     QString("retry-%1")
                                     .arg((ulong)retries, 2, 10,
@@ -717,14 +722,16 @@ class Script: public QObject {
           if (screenshots)
             try { // write html source and take a last screenshot on error
               {
+                Logger log(0, this);
                 QString filename(Screenshot::sourceHtml
-                                 ((*cmd)->line(), targetdir(),
+                                 (log, (*cmd)->line(), targetdir(),
                                   _testclass,
                                   "error", frame));
                 plainlog("[[ATTACHMENT|"+filename+"]]");
               } {
+                Logger log(0, this);
                 QString filename(Screenshot::screenshot
-                                 ((*cmd)->line(), targetdir(),
+                                 (log, (*cmd)->line(), targetdir(),
                                   _testclass,
                                   "error", frame));
                 plainlog("[[ATTACHMENT|"+filename+"]]");
@@ -734,7 +741,7 @@ class Script: public QObject {
         }
       }
       removeSignals(frame);
-      if (!_signals.empty()) throw UnhandledSignals(_signals);
+      if (!_signals.empty()) error(UnhandledSignals(_signals));
       progress("success", 0, 0);
       return res;
     }
@@ -798,9 +805,9 @@ class Script: public QObject {
     QStringList variables() {
       return _variables.keys();
     }
-    QString variable(QString name) {
+    QString variable(Logger& log, QString name) {
       QMap<QString, QString>::iterator it(_variables.find(name));
-      if (it==_variables.end()) throw VariableNotFound(name);
+      if (it==_variables.end()) error(VariableNotFound(name));
       return *it;
     }
     /// Copy context from other script
@@ -829,10 +836,10 @@ class Script: public QObject {
     void function(QString name, std::shared_ptr<Function> f) {
       _functions[name] = f;
     }
-    std::shared_ptr<Function> function(QString name) {
+    std::shared_ptr<Function> function(Logger& log, QString name) {
       QMap<QString, std::shared_ptr<Function> >::iterator
         it(_functions.find(name));
-      if (it==_functions.end()) throw FunctionNotFound(name);
+      if (it==_functions.end()) error(FunctionNotFound(name));
       return *it;
     }
     void timeout(int t) {
@@ -942,6 +949,10 @@ class Script: public QObject {
       _cout += text + "\n";
     }
   private:
+    void error(const Exception& e) {
+      log(QString("  FAILED: ")+e.what());
+      throw e;
+    }
     std::shared_ptr<Command> unknown(QString command) {
       if (!command.size())
         return std::shared_ptr<Command>(new Empty());
@@ -998,7 +1009,7 @@ class Script: public QObject {
                                    QStringList(url.toString())));
     }
     void timeout() {
-      throw TimeOut();
+      error(TimeOut());
     }
   private:
     typedef std::map<QString, std::shared_ptr<Command>> Prototypes;
@@ -1056,7 +1067,7 @@ class Do: public Command {
       if (_selector.size()) {
         element = find(frame, script->replacevars(_selector));
         if (element.isNull())
-          throw ElementNotFound(script->replacevars(_selector));
+          error(log, ElementNotFound(script->replacevars(_selector)));
       }
       _result =
         element.evaluateJavaScript(script->replacevars(_javascript)).toString();
@@ -1138,19 +1149,19 @@ class Expect: public Command {
       QStringList args(script->replacevars(_signal._args));
       Script::Signal lastsignal(script->getSignal());
       if (_signal._signal=="load") { // special signal load
-        if (lastsignal.first=="loadStarted") {
-          log("ignore loadStarted");
+        while (lastsignal.first=="loadStarted") {
+          log("ignore signal: loadStarted");
           lastsignal = script->getSignal(); // ignore optional loadStarted
         }
         if (lastsignal.first!="urlChanged" || (args.size() && lastsignal.second!=args))
-          throw WrongSignal("urlChanged", args, lastsignal);
+          error(log, WrongSignal("urlChanged", args, lastsignal));
         lastsignal = script->getSignal();
         args=QStringList("true");
         if (lastsignal.first!="loadFinished" || (lastsignal.second!=args))
-          throw WrongSignal("loadFinished", args, lastsignal);
+          error(log, WrongSignal("loadFinished", args, lastsignal));
       } else {
         if (lastsignal.first!=_signal._signal || (args.size() && lastsignal.second!=args))
-          throw WrongSignal(_signal._signal, args, lastsignal);
+          error(log, WrongSignal(_signal._signal, args, lastsignal));
       }
       return true;
     }
@@ -1221,8 +1232,8 @@ class Sleep: public Command {
       bool ok;
       unsigned int time(script->replacevars(_time).toUInt(&ok));
       if (!ok)
-        throw BadArgument(script->replacevars(_time)
-                          +" should be a number of seconds");
+        error(log, BadArgument(script->replacevars(_time)
+                               +" should be a number of seconds"));
       sleep(time);
       return true;
     }
@@ -1342,7 +1353,7 @@ class Upload: public Command {
       QStringList allargs(args.split("->"));
       if (allargs.size()<2)
         throw BadArgument(tag()+"requires <selector> -> <filename>, "
-                          "instead of: \""+args+"\"");
+                               "instead of: \""+args+"\"");
       cmd->_selector = allargs.takeFirst().trimmed();
       cmd->_filename = allargs.join("->").trimmed();
       return cmd;
@@ -1364,9 +1375,9 @@ class Upload: public Command {
         if (files.size()==1) filename=files[0];
       }
       page->setNextUploadFile(filename);
-      realMouseClick(frame, script->replacevars(_selector));
+      realMouseClick(log, frame, script->replacevars(_selector));
       if (page->uploadPrepared())
-        throw SetFileUploadFailed(script->replacevars(_selector), filename);
+        error(log, SetFileUploadFailed(script->replacevars(_selector), filename));
       return true;
     }
   private:
@@ -1416,14 +1427,14 @@ class Exists: public Command {
       }
       QWebElement element(find(frame, selector));
       if (text.isEmpty())
-        throw AssertionFailed("element not found: "+selector);
+        error(log, AssertionFailed("element not found: "+selector));
       else if (element.isNull())
-        throw AssertionFailed("expected \""+text+"\" in non existing element "
-                              +selector);
+        error(log, AssertionFailed("expected \""+text+"\" in non existing element "
+                                   +selector));
       else
-        throw AssertionFailed("not found \""+text+"\" in \""
-                              +notfound.join("\", \"")+"\" on "+selector);
-      return true; // never reached due to throw above
+        error(log, AssertionFailed("not found \""+text+"\" in \""
+                                   +notfound.join("\", \"")+"\" on "+selector));
+      return true; // never reached due to error, above
     }
   private:
     QString _selector;
@@ -1465,10 +1476,10 @@ class Not: public Command {
       QString text(script->replacevars(_text));
       Q_FOREACH(QWebElement element, frame->findAllElements(selector)) {
         if (text.isEmpty())
-          throw AssertionFailed("element must not exists: "+selector);
+          error(log, AssertionFailed("element must not exists: "+selector));
         if (element.toOuterXml().indexOf(text)!=-1)
-          throw AssertionFailed("\""+text+"\" must not be in \""
-                                +element.toInnerXml()+"\" on "+selector);
+          error(log, AssertionFailed("\""+text+"\" must not be in \""
+                                     +element.toInnerXml()+"\" on "+selector));
       }
       return true;
     }
@@ -1517,23 +1528,23 @@ class Execute: public Command {
       exec.setProcessChannelMode(QProcess::MergedChannels);
       exec.start(command, args);
       if (!exec.waitForStarted())
-        throw CannotStartScript(command, args, scripttxt);
+        error(log, CannotStartScript(command, args, scripttxt));
       if (scripttxt.size()) {
         if (exec.write(scripttxt.toUtf8())!=scripttxt.toUtf8().size() ||
             !exec.waitForBytesWritten(60000))
-          throw CannotLoadScript(command, args, scripttxt);
+          error(log, CannotLoadScript(command, args, scripttxt));
       }
       exec.closeWriteChannel();
       if (!exec.waitForFinished(60000) && exec.state()!=QProcess::NotRunning)
-        throw ScriptNotFinished(command, args, scripttxt);
+        error(log, ScriptNotFinished(command, args, scripttxt));
       QString stdout(exec.readAllStandardOutput());
       QString stderr(exec.readAllStandardError());
       _result = stdout;
       log("result: "+(_result.size()?_result:"(void)"));
       script->log(stdout);
       if (exec.exitCode()!=0 || exec.exitStatus()!=QProcess::NormalExit)
-        throw ScriptExecutionFailed(command, args, scripttxt,
-                                    exec.exitCode(), stdout, stderr);
+        error(log, ScriptExecutionFailed(command, args, scripttxt,
+                                         exec.exitCode(), stdout, stderr));
       return true;
     }
   private:
@@ -1585,8 +1596,8 @@ class Download: public Command {
           QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
         log("download terminated "+
             QString(_netsuccess&&_filesuccess?"successfully":"with error"));
-        if (!_netsuccess) throw DownloadFailed(_realfilename);
-        if (!_filesuccess) throw WriteFileFailed(_realfilename);
+        if (!_netsuccess) error(log, DownloadFailed(_realfilename));
+        if (!_filesuccess) error(log, WriteFileFailed(_realfilename));
         log["[[ATTACHMENT|"+QDir(_realfilename).absolutePath()+"]]"];
         disconnect(frame->page(), SIGNAL(unsupportedContent(QNetworkReply*)),
                    this, SLOT(unsupportedContent(QNetworkReply*)));
@@ -1660,14 +1671,14 @@ class Click: public Command {
       QString clicktarget(script->replacevars(_selector));
       switch (_clicktype ? *_clicktype : script->clicktype()) {
         case Script::REAL_MOUSE_CLICK: {
-          realMouseClick(frame, clicktarget);
+          realMouseClick(log, frame, clicktarget);
           break;
         }
         case Script::JAVASCRIPT_CLICK:
         default: {
           QWebElement element(find(frame, clicktarget));
           if (element.isNull())
-            throw ElementNotFound(clicktarget);
+            error(log, ElementNotFound(clicktarget));
           _result = element.evaluateJavaScript("this.click();").toString();
           if (_result.size()) log("result: "+_result.size());
           break;
@@ -1791,8 +1802,8 @@ class Timeout: public Command {
       Logger log(this, script);
       bool ok;
       int timeout(script->replacevars(_timeout).toInt(&ok));
-      if (!ok) throw BadArgument(script->replacevars(_timeout)
-                                 +" should be a number of seconds");
+      if (!ok) error(log, BadArgument(script->replacevars(_timeout)
+                                      +" should be a number of seconds"));
       script->timeout(timeout);
       return true;
     }
@@ -1826,9 +1837,9 @@ class CaCertificate: public Command {
       QFile cacertfile(script->path()+filename);
       if (!cacertfile.exists()) cacertfile.setFileName(filename); // try without path
       if (!cacertfile.exists() || !cacertfile.open(QIODevice::ReadOnly))
-        throw FileNotFound(filename);
+        error(log, FileNotFound(filename));
       QSslCertificate cacert(&cacertfile);
-      if (cacert.isNull()) throw NotACertificate(filename);
+      if (cacert.isNull()) error(log, NotACertificate(filename));
       QSslSocket::addDefaultCaCertificate(cacert);
       return true;
     }
@@ -1873,19 +1884,19 @@ class ClientCertificate: public Command {
       QFile certfile(script->path()+filename);
       if (!certfile.exists()) certfile.setFileName(filename);
       if (!certfile.exists() || !certfile.open(QIODevice::ReadOnly))
-        throw FileNotFound(filename);
+        error(log, FileNotFound(filename));
       QSslCertificate cert(&certfile);
-      if (cert.isNull()) throw NotACertificate(filename);
+      if (cert.isNull()) error(log, NotACertificate(filename));
       sslConfig.setLocalCertificate(cert);
       filename = script->replacevars(_keyfile);
       QFile keyfile(script->path()+filename);
       if (!keyfile.exists()) keyfile.setFileName(filename);
       if (!keyfile.exists() || !keyfile.open(QIODevice::ReadOnly))
-        throw FileNotFound(filename);
+        error(log, FileNotFound(filename));
       keyfile.open(QIODevice::ReadOnly);
       QSslKey k(&keyfile, QSsl::Rsa, QSsl::Pem,
                 QSsl::PrivateKey, script->replacevars(_password).toUtf8());
-      if (k.isNull()) throw KeyNotReadable(filename);
+      if (k.isNull()) error(log, KeyNotReadable(filename));
       sslConfig.setPrivateKey(k);
       QSslConfiguration::setDefaultConfiguration(sslConfig);
       return true;
@@ -1970,7 +1981,7 @@ class SetValue: public Command {
       QStringList allargs(args.split("->"));
       if (allargs.size()<2)
         throw BadArgument(tag()+" requires <selector> -> <value>, "
-                          "instead of: \""+args+"\"");
+                               "instead of: \""+args+"\"");
       cmd->_selector = allargs.takeFirst().trimmed();
       cmd->_value = allargs.join("->").trimmed();
       return cmd;
@@ -1979,7 +1990,7 @@ class SetValue: public Command {
       Logger log(this, script);
       QWebElement element(find(frame, script->replacevars(_selector)));
       if (element.isNull())
-        throw ElementNotFound(script->replacevars(_selector));
+        error(log, ElementNotFound(script->replacevars(_selector)));
       QString value(script->replacevars(_value));
       if (element.tagName()=="SELECT") {
         // value is a comma seperated list of option values
@@ -2045,12 +2056,12 @@ class Function: public Command {
       Logger log(this, script, false);
       return true;
     }
-    bool call(Command* parentCommand, QStringList args,
-                 Script* script, QWebFrame* frame) {
+    bool call(Logger& log, Command* parentCommand, QStringList args,
+              Script* script, QWebFrame* frame) {
       try {
-        return runScript(parentCommand, _script, script, frame, _vars, args);
-      } catch (const std::exception& x) {
-        throw FunctionCallFailed(_name, _vars, args, x);
+        return runScript(log, parentCommand, _script, script, frame, _vars, args);
+      } catch (const Exception& x) {
+        error(log, FunctionCallFailed(_name, _vars, args, x));
       }
     }
   private:
@@ -2087,8 +2098,8 @@ class Call: public Command {
     }
     bool execute(Script* script, QWebFrame* frame) {
       Logger log(this, script);
-      return script->function(_name)->call(this, script->replacevars(_args),
-                                           script, frame);
+      return script->function(log, _name)->call(log, this, script->replacevars(_args),
+                                                script, frame);
     }
   public:
     QString _name;
@@ -2178,28 +2189,28 @@ class If: public Command {
             +selector+" "+_cmp+" "+value);
       } else {
         switch (_cmp[0].toLatin1()) {
-          case '=': check = script->variable(_variable)==value;
+          case '=': check = script->variable(log, _variable)==value;
             break;
-          case '!': check = script->variable(_variable)!=value;
+          case '!': check = script->variable(log, _variable)!=value;
             break;
-          case '.': check = script->variable(_variable).contains(value);
+          case '.': check = script->variable(log, _variable).contains(value);
             break;
-          case '^': check = !script->variable(_variable).contains(value);
+          case '^': check = !script->variable(log, _variable).contains(value);
             break;
           case '~': check =
-              script->variable(_variable).contains(QRegularExpression(value));
+              script->variable(log, _variable).contains(QRegularExpression(value));
             break;
-          case '<': check = script->variable(_variable).toInt()<value.toInt();
+          case '<': check = script->variable(log, _variable).toInt()<value.toInt();
             break;
-          case '>': check = script->variable(_variable).toInt()>value.toInt();
+          case '>': check = script->variable(log, _variable).toInt()>value.toInt();
             break;
           default:;
         }
         log(QString("evaluated expression to ")+(check?"true":"false")+": "
-            +script->variable(_variable)+" "+_cmp+" "+value);
+            +script->variable(log, _variable)+" "+_cmp+" "+value);
       }
-      if (check) return runScript(this, _script, script, frame);
-      else if (_else) return runScript(this, _else, script, frame);
+      if (check) return runScript(log, this, _script, script, frame);
+      else if (_else) return runScript(log, this, _else, script, frame);
       return true;
     }
   private:
@@ -2332,7 +2343,7 @@ class Check: public Command {
         default:;
       }
       log("evaluated expression: "+value1+" "+_cmp+" "+value2);
-      if (!check) throw CheckFailed(value1, _cmp, value2);
+      if (!check) error(log, CheckFailed(value1, _cmp, value2));
       return true;
     }
   private:
@@ -2379,8 +2390,8 @@ class For: public Command {
     }
     bool execute(Script* script, QWebFrame* frame) {
       Logger log(this, script);
-      Q_FOREACH(QString i, _vals.size()?_vals:commaSeparatedList(script->variable(_variable))) {
-        if (!runScript(this, _script, script, frame, QStringList()<<_variable, QStringList()<<i))
+      Q_FOREACH(QString i, _vals.size()?_vals:commaSeparatedList(script->variable(log, _variable))) {
+        if (!runScript(log, this, _script, script, frame, QStringList()<<_variable, QStringList()<<i))
           return false;
       }
       return true;
@@ -2444,7 +2455,7 @@ class OfflineStoragePath: public Command {
       Logger log(this, script);
       QDir path(_path);
       if (!path.exists() && !path.mkpath(_path))
-        throw DirectoryCannotBeCreated(_path);
+        error(log, DirectoryCannotBeCreated(_path));
       TestWebPage* page(dynamic_cast<TestWebPage*>(frame->page()));
       page->settings()->setOfflineStoragePath(_path);
       return true;
@@ -2513,16 +2524,18 @@ class Include: public Command {
       try {
         cmd->_script = std::shared_ptr<Script>(new Script);
         cmd->_script->parse(txt.split('\n'), cmd->_filename, 1, indent+1);
-      } catch (std::exception& e) {
+      } catch (Exception& e) {
         throw ParseIncludeFailed(cmd->_filename, e.what());
       }
       return cmd;
     }
-    bool execute(Script* script, QWebFrame* frame) try {
+    bool execute(Script* script, QWebFrame* frame) {
       Logger log(this, script);
-      return runScript(this, _script, script, frame);
-    } catch (std::exception& e) {
-      throw ExecuteIncludeFailed(_filename, e.what());
+      try {
+        return runScript(log, this, _script, script, frame);
+      } catch (Exception& e) {
+        error(log, ExecuteIncludeFailed(_filename, e.what()));
+      }
     }
   private:
     QString _filename;
@@ -2624,27 +2637,27 @@ class Case: public Command {
               +selector+" "+condition.cmp+" "+value);
         } else {
           switch (condition.cmp[0].toLatin1()) {
-            case '=': check = script->variable(_variable)==value;
+            case '=': check = script->variable(log, _variable)==value;
               break;
-            case '!': check = script->variable(_variable)!=value;
+            case '!': check = script->variable(log, _variable)!=value;
               break;
-            case '.': check = script->variable(_variable).contains(value);
+            case '.': check = script->variable(log, _variable).contains(value);
               break;
-            case '^': check = !script->variable(_variable).contains(value);
+            case '^': check = !script->variable(log, _variable).contains(value);
               break;
             case '~': check =
-                script->variable(_variable).contains(QRegularExpression(value));
+                script->variable(log, _variable).contains(QRegularExpression(value));
               break;
-            case '<': check = script->variable(_variable).toInt()<value.toInt();
+            case '<': check = script->variable(log, _variable).toInt()<value.toInt();
               break;
-            case '>': check = script->variable(_variable).toInt()>value.toInt();
+            case '>': check = script->variable(log, _variable).toInt()>value.toInt();
               break;
             default:;
           }
           log(QString("evaluated expression to ")+(check?"true":"false")+": "
-              +script->variable(_variable)+" "+condition.cmp+" "+value);
+              +script->variable(log, _variable)+" "+condition.cmp+" "+value);
         }
-        if (check) return runScript(this, condition.script, script, frame);
+        if (check) return runScript(log, this, condition.script, script, frame);
       }
       return true;
     }
@@ -2684,7 +2697,7 @@ class Fail: public Command {
     }
     bool execute(Script* script, QWebFrame*) {
       Logger log(this, script);
-      throw TestFailed(script->replacevars(_text));
+      error(log, TestFailed(script->replacevars(_text)));
       return true; // dummy
     }
   private:
@@ -2725,7 +2738,7 @@ inline bool Screenshot::execute(Script* script, QWebFrame* frame) {
     log("screenshots disabled");
     return true;
   }
-  QString filename(screenshot(line(), script->targetdir(),
+  QString filename(screenshot(log, line(), script->targetdir(),
                               script->testclass(),
                               script->replacevars(_filename), frame));
   log["[[ATTACHMENT|"+filename+"]]"];
@@ -2734,26 +2747,30 @@ inline bool Screenshot::execute(Script* script, QWebFrame* frame) {
 
 inline Logger::Logger(Command* command, Script* script, bool showLines):
     _command(command), _script(script) {
-  _previous = _script->command();
-  _script->command(command);
-  if (_command->log())
-    if (showLines)
-      _script->log("\\ "+_command->command(), _command);
-    else
-      _script->log("\\ "+_command->command().split('\n').first(), _command);
+  if (command) {
+    _previous = _script->command();
+    _script->command(command);
+    if (_command->log())
+      if (showLines)
+        _script->log("\\ "+_command->command(), _command);
+      else
+        _script->log("\\ "+_command->command().split('\n').first(), _command);
+  }
 }
 inline void Logger::operator()(QString txt) {
-  if (_command->log()) _script->log("  "+txt, _command);
+  if (!_command || _command->log()) _script->log("  "+txt, _command);
 }
 inline void Logger::operator[](QString txt) {
   _script->plainlog(txt);
 }
 inline Logger::~Logger() {
-  if (_command->log()) _script->log("/ "+_command->tag(), _command);
-  _script->command(_previous);
+  if (_command) {
+    if (_command->log()) _script->log("/ "+_command->tag(), _command);
+    _script->command(_previous);
+  }
 }
 
-inline bool Command::runScript(Command* parentCommand,
+inline bool Command::runScript(Logger& log, Command* parentCommand,
                                std::shared_ptr<Script> script,
                                Script* parent, QWebFrame* frame,
                                QStringList vars,
@@ -2761,7 +2778,7 @@ inline bool Command::runScript(Command* parentCommand,
   Script scriptCopy(*script); // only work with a copy of script
   scriptCopy.set(*parent);
   if (args.size()!=vars.size())
-    throw WrongNumberOfArguments(vars, args);
+    error(log, WrongNumberOfArguments(vars, args));
   for (QStringList::iterator var(vars.begin()), arg(args.begin());
        var<vars.end() && arg<args.end(); ++var, ++arg) {
     parent->log("argument: "+*var+" = "+parent->replacevars(*arg),
@@ -2778,13 +2795,13 @@ inline bool Command::runScript(Command* parentCommand,
                parent, SLOT(parentlog(QString)));
     parentCommand->_result = scriptCopy.result();
     Q_FOREACH(QString key, scriptCopy.variables()) // copy new variables to parent
-      if (!vars.contains(key)) parent->set(key, scriptCopy.variable(key));
+      if (!vars.contains(key)) parent->set(key, scriptCopy.variable(log, key));
     Q_FOREACH(QString key, scriptCopy.functions()) // copy new functions to parent
-      parent->function(key, scriptCopy.function(key));
+      parent->function(key, scriptCopy.function(log, key));
     if (parentCommand->_result.size())
       parent->log("result: "+parentCommand->_result);
     return res;
-  } catch (const std::exception& x) {
+  } catch (const Exception& x) {
     parent->addSignals(frame);
     disconnect(&scriptCopy, SIGNAL(logging(QString)),
                parent, SLOT(parentlog(QString)));