OSX: When disconnecting secondary monitor application hangs

$ 2dpainting.app/Contents/MacOS/2dpainting 
2014-04-03 12:42:37.075 2dpainting[29451:707] invalid drawable
2014-04-03 12:42:57.678 2dpainting[29451:707] *** -[__NSArrayI objectAtIndex:]: index 1 beyond bounds [0 .. 0]
2014-04-03 12:42:57.682 2dpainting[29451:707] (
	0   CoreFoundation                      0x00007fff8bbccb06 __exceptionPreprocess + 198
	1   libobjc.A.dylib                     0x00007fff848733f0 objc_exception_throw + 43
	2   CoreFoundation                      0x00007fff8bb7fb53 -[__NSArrayI objectAtIndex:] + 163
	3   libqcocoa.dylib                     0x0000000102e076e4 _ZNK12QCocoaScreen16devicePixelRatioEv + 68
	4   QtWidgets                           0x00000001000f2dfe _ZNK7QWidget6metricEN12QPaintDevice17PaintDeviceMetricE + 510
	5   QtGui                               0x00000001008b23ed _ZN8QPainter5beginEP12QPaintDevice + 3149
	6   2dpainting                          0x0000000100002d78 _ZN8GLWidget10paintEventEP11QPaintEvent + 40
	7   QtWidgets                           0x00000001000d66a6 _ZN7QWidget5eventEP6QEvent + 1958
	8   QtOpenGL                            0x0000000100038eee _ZN9QGLWidget5eventEP6QEvent + 46
	9   QtWidgets                           0x000000010009e37c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 300
	10  QtWidgets                           0x00000001000a0d71 _ZN12QApplication6notifyEP7QObjectP6QEvent + 5985
	11  QtCore                              0x0000000100dcfc92 _ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent + 114
	12  QtWidgets                           0x00000001000d1335 _ZN14QWidgetPrivate10drawWidgetEP12QPaintDeviceRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore + 2997
	13  QtWidgets                           0x00000001000aa1d0 _ZN14QWidgetPrivate11repaint_sysERK7QRegion + 400
	14  QtWidgets                           0x00000001000c89ce _ZN14QWidgetPrivate16syncBackingStoreEv + 110
	15  QtWidgets                           0x00000001000d694d _ZN7QWidget5eventEP6QEvent + 2637
	16  QtOpenGL                            0x0000000100038eee _ZN9QGLWidget5eventEP6QEvent + 46
	17  QtWidgets                           0x000000010009e37c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 300
	18  QtWidgets                           0x00000001000a0d71 _ZN12QApplication6notifyEP7QObjectP6QEvent + 5985
	19  QtCore                              0x0000000100dcfc92 _ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent + 114
	20  QtWidgets                           0x00000001000a6954 _ZN19QWidgetBackingStore17sendUpdateRequestEP7QWidgetNS_10UpdateTimeE + 68
	21  QtWidgets                           0x00000001000a729f _ZN19QWidgetBackingStore9markDirtyERK5QRectP7QWidgetNS_10UpdateTimeENS_11BufferStateE + 815
	22  QtWidgets                           0x00000001000d8e4d _ZN7QWidget7repaintERK5QRect + 157
	23  QtWidgets                           0x00000001000d8da4 _ZN7QWidget7repaintEv + 52
	24  QtCore                              0x0000000100e03e6f _ZN11QMetaObject8activateEP7QObjectiiPPv + 1871
	25  QtCore                              0x0000000100dfccd3 _ZN7QObject5eventEP6QEvent + 51
	26  QtWidgets                           0x000000010009e37c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 300
	27  QtWidgets                           0x00000001000a0d71 _ZN12QApplication6notifyEP7QObjectP6QEvent + 5985
	28  QtCore                              0x0000000100dcfc92 _ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent + 114
	29  QtCore                              0x0000000100e26426 _ZN14QTimerInfoList14activateTimersEv + 1302
	30  libqcocoa.dylib                     0x0000000102e1d5f5 _ZN28QCocoaEventDispatcherPrivate28activateTimersSourceCallbackEPv + 21
	31  CoreFoundation                      0x00007fff8bb4bb31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
	32  CoreFoundation                      0x00007fff8bb4b455 __CFRunLoopDoSources0 + 245
	33  CoreFoundation                      0x00007fff8bb6e7f5 __CFRunLoopRun + 789
	34  CoreFoundation                      0x00007fff8bb6e0e2 CFRunLoopRunSpecific + 290
	35  HIToolbox                           0x00007fff86faaeb4 RunCurrentEventLoopInMode + 209
	36  HIToolbox                           0x00007fff86faac52 ReceiveNextEventCommon + 356
	37  HIToolbox                           0x00007fff86faaae3 BlockUntilNextEventMatchingListInMode + 62
	38  AppKit                              0x00007fff89e1e533 _DPSNextEvent + 685
	39  AppKit                              0x00007fff89e1ddf2 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
	40  AppKit                              0x00007fff89e151a3 -[NSApplication run] + 517
	41  libqcocoa.dylib                     0x0000000102e1e374 _ZN21QCocoaEventDispatcher13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 2404
	42  QtCore                              0x0000000100dcccfd _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE + 381
	43  QtCore                              0x0000000100dd0247 _ZN16QCoreApplication4execEv + 359
	44  2dpainting                          0x00000001000033b6 main + 70
	45  2dpainting                          0x0000000100002b64 start + 52
)
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QPaintDevice: Cannot destroy paint device that is being painted