Crash in CppTools::CppRefactoringFile

Core was generated by `./creator-2.5-32/bin/qtcreator'.
Program terminated with signal 11, Segmentation fault.
#0  0x0278e287 in CppTools::CppRefactoringFile::startOf (this=0xa523b120, ast=0x0)
    at ../../../../creator-2.5/src/plugins/cpptools/cpprefactoringchanges.cpp:233
233         return startOf(ast->firstToken());
(gdb) bt
#0  0x0278e287 in CppTools::CppRefactoringFile::startOf (this=0xa523b120, ast=0x0)
    at ../../../../creator-2.5/src/plugins/cpptools/cpprefactoringchanges.cpp:233
#1  0x0261af92 in CppEditor::Internal::FunctionDeclDefLink::changes (
    this=0x10af7268, snapshot=..., targetOffset=-1)
    at ../../../../creator-2.5/src/plugins/cppeditor/cppfunctiondecldeflink.cpp:646
#2  0x025d926c in CppEditor::Internal::CPPEditorWidget::updateFunctionDeclDefLinkNow
    (this=0x10f7c700)
    at ../../../../creator-2.5/src/plugins/cppeditor/cppeditor.cpp:2220
#3  0x02623145 in CppEditor::Internal::CPPEditorWidget::qt_static_metacall (_o=
    0x10f7c700, _c=QMetaObject::InvokeMetaMethod, _id=23, _a=0xbfb4f310)
    at .moc/debug-shared/moc_cppeditor.cpp:282
#4  0x005913a5 in QMetaObject::activate (sender=0xb1e28900, m=0x72146c, 
    local_signal_index=0, argv=0x0)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qobject.cpp:3547
#5  0x005eb2b7 in QTimer::timeout (this=0xb1e28900)
    at .moc/debug-shared/moc_qtimer.cpp:148
#6  0x00599a7c in QTimer::timerEvent (this=0xb1e28900, e=0xbfb4f888)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qtimer.cpp:280
#7  0x0058c8ca in QObject::event (this=0xb1e28900, e=0xbfb4f888)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qobject.cpp:1157
#8  0x00d59574 in QApplicationPrivate::notify_helper (this=0x91a89f0, 
    receiver=0xb1e28900, e=0xbfb4f888)
    at /home/kkoehne/dev/qt/qt-4.8/src/gui/kernel/qapplication.cpp:4554
#9  0x00d56e72 in QApplication::notify (this=0xbfb4fba8, receiver=0xb1e28900, 
    e=0xbfb4f888) at /home/kkoehne/dev/qt/qt-4.8/src/gui/kernel/qapplication.cpp:3936
#10 0x00575b2a in QCoreApplication::notifyInternal (this=0xbfb4fba8, 
    receiver=0xb1e28900, event=0xbfb4f888)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qcoreapplication.cpp:876
#11 0x00d4b2d3 in QCoreApplication::sendEvent (receiver=0xb1e28900, event=0xbfb4f888)
    at ../../include/QtCore/../../../qt-4.8/src/corelib/kernel/qcoreapplication.h:231
#12 0x005af66f in QTimerInfoList::activateTimers (this=0x91ac2cc)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qeventdispatcher_unix.cpp:611
#13 0x005ac1e7 in timerSourceDispatch (source=0x91ac298)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qeventdispatcher_glib.cpp:186
#14 0x005ac29f in idleTimerSourceDispatch (source=0x91ac700)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qeventdispatcher_glib.cpp:233
#15 0x009d225f in g_main_context_dispatch ()
   from /lib/i386-linux-gnu/libglib-2.0.so.0
#16 0x009d2990 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#17 0x009d2c2a in g_main_context_iteration ()
   from /lib/i386-linux-gnu/libglib-2.0.so.0
#18 0x005acb38 in QEventDispatcherGlib::processEvents (this=0x91a94f8, flags=...)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qeventdispatcher_glib.cpp:424
#19 0x00e22a30 in QGuiEventDispatcherGlib::processEvents (this=0x91a94f8, flags=...)
    at /home/kkoehne/dev/qt/qt-4.8/src/gui/kernel/qguieventdispatcher_glib.cpp:204
#20 0x005735f1 in QEventLoop::processEvents (this=0xbfb4fb1c, flags=...)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qeventloop.cpp:149
#21 0x0057375f in QEventLoop::exec (this=0xbfb4fb1c, flags=...)
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qeventloop.cpp:204
#22 0x005761a6 in QCoreApplication::exec ()
    at /home/kkoehne/dev/qt/qt-4.8/src/corelib/kernel/qcoreapplication.cpp:1148
#23 0x00d56ae6 in QApplication::exec ()
    at /home/kkoehne/dev/qt/qt-4.8/src/gui/kernel/qapplication.cpp:3815
#24 0x08051576 in main (argc=1, argv=0xbfb4ff14)
    at ../../../creator-2.5/src/app/main.cpp:421