Crash when updating QML file while debugging

Steps to reproduce:

Unzip attached test app. Build it for desktop (or Symbian if you're feeling brave). Start test app under the QML debugger. Once you see the "Hello world!" window appear, open main.qml in creator and add the following additional clause to the MouseArea after onClicked:

        onDoubleClicked: {
            thetxt.rotation += 45;
        }

Save the QML file. The automatic updating thingy will kick in and reload the QML - at which point the process being debugged crashes. Debugger log and callstack (from Symbian build) attached. Looks like a null pointer crash.

Note I couldn't get a proper stack trace from windows because of QTCREATORBUG-4718, so the attached on is an approximate one when running on Symbian, using fshell's fdb command. CODA detected the crash but couldn't decode the callstack, which is why I'm using fdb instead, and also why fdb reports the thread as "still running" (in case you were wondering). But the crash is 100% reproducible in Windows too. Crash occurs whether using just QML debugging or combined QML and C++ debugging.