null stack in ChromeClient

gistfile1.diff

diff --git a/src/qt/src/3rdparty/webkit/Source/WebKit/qt/WebCoreSupport/ChromeClientQt.cpp b/src/qt/src/3rdparty/webkit/Source/WebKit/qt/WebCoreSupport/ChromeClientQt.cpp
index c8e40e6..fe98941 100644
--- a/src/qt/src/3rdparty/webkit/Source/WebKit/qt/WebCoreSupport/ChromeClientQt.cpp
+++ b/src/qt/src/3rdparty/webkit/Source/WebKit/qt/WebCoreSupport/ChromeClientQt.cpp
@@ -305,7 +305,9 @@ void ChromeClientQt::addMessageToConsole(MessageSource src, MessageType type, Me
     // the MessageType value isn't useful - it will be LogMessageType for both errors
     // and log messages.
     if (level == ErrorMessageLevel) {
-        QString stack = callStack->buildInspectorArray()->toJSONString();
+        QString stack = "[]";
+        if (callStack)
+            callStack->buildInspectorArray()->toJSONString();
         m_webPage->javaScriptError(x, lineNumber, y, stack);
     } else {
         m_webPage->javaScriptConsoleMessage(x, lineNumber, y);