Crash in Qt with on OSX 10.10 handling notification

Application cashes intermittently with following stack trace. There are no reproduction steps. User was not interacting with the GUI at the time of crash.
==================================================================================
Process: <redacted>[443]
Path: <redacted>
Identifier: <redacted>
Version: 5.4.1 (???)
Code Type: X86-64 (Native)
Parent Process: <redacted>[442]
Responsible: <redacted>[442]
User ID: 501

Date/Time: 2014-10-27 16:08:47.339 -0700
OS Version: Mac OS X 10.10 (14A389)
Report Version: 11
Anonymous UUID: 841608ED-B438-1EE9-172B-036ABC7000C6

Sleep/Wake UUID: 03AB8617-4CE5-4A69-8288-C16629C2C777

Time Awake Since Boot: 13000 seconds
Time Since Wake: 340 seconds

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 QtGui 0x0000000107c91da4 QPlatformScreen::screen() const + 4
1 libqcocoa.dylib 0x000000011829a0f0 -[QNSView windowNotification:] + 608
2 com.apple.CoreFoundation 0x00007fff96bd3cbc _CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER_ + 12
3 com.apple.CoreFoundation 0x00007fff96ac51b4 _CFXNotificationPost + 3140
4 com.apple.Foundation 0x00007fff9594eea1 -[NSNotificationCenter postNotificationName:object:userInfo:] + 66
5 com.apple.AppKit 0x00007fff92f99b05 NSPerformWithScreenUpdatesDisabled + 65
6 com.apple.AppKit 0x00007fff92f99ab2 -[NSWindow _updateSettingsSendingScreenChangeNotificationIfNeeded:] + 366
7 com.apple.AppKit 0x00007fff92f92c74 -[NSWindow _setFrame:updateBorderViewSize:] + 1099
8 com.apple.AppKit 0x00007fff92f922d3 -[NSWindow _oldPlaceWindow:] + 1118
9 com.apple.AppKit 0x00007fff92f917ea -[NSWindow _setFrameCommon:display:stashSize:] + 2527
10 com.apple.AppKit 0x00007fff935cd598 -[NSWindow _adjustWindowToScreen] + 3049
11 com.apple.AppKit 0x00007fff935cd7c8 -[NSWindow _displayChangedSoAdjustWindows:] + 89
12 com.apple.AppKit 0x00007fff930e6a72 __44-[NSApplication makeWindowsPerform:inOrder:]_block_invoke + 27
13 com.apple.AppKit 0x00007fff92e9c994 -[NSApplication _findWindowInOrder:passingTest:] + 374
14 com.apple.AppKit 0x00007fff92e9c811 -[NSApplication makeWindowsPerform:inOrder:] + 81
15 com.apple.AppKit 0x00007fff931dfe06 -[NSApplication _reactToScreenInvalidationImmediately:] + 67
16 com.apple.AppKit 0x00007fff931dfd7d __44-[NSApplication _reactToScreenInvalidation:]_block_invoke + 75
17 com.apple.CoreFoundation 0x00007fff96b3554c _CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK_ + 12
18 com.apple.CoreFoundation 0x00007fff96b27655 __CFRunLoopDoBlocks + 341
19 com.apple.CoreFoundation 0x00007fff96b26e0e __CFRunLoopRun + 910
20 com.apple.CoreFoundation 0x00007fff96b26838 CFRunLoopRunSpecific + 296
21 com.apple.HIToolbox 0x00007fff9434a43f RunCurrentEventLoopInMode + 235
22 com.apple.HIToolbox 0x00007fff9434a0be ReceiveNextEventCommon + 179
23 com.apple.HIToolbox 0x00007fff94349ffb _BlockUntilNextEventMatchingListInModeWithFilter + 71
24 com.apple.AppKit 0x00007fff92ea1821 _DPSNextEvent + 964
25 com.apple.AppKit 0x00007fff92ea0fd0 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 194
26 com.apple.AppKit 0x00007fff92e94f73 -[NSApplication run] + 594
27 libqcocoa.dylib 0x00000001182a3fb5 QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 2149
28 QtCore 0x0000000102dbbf9d QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 381
29 QtCore 0x0000000102dbee9c QCoreApplication::exec() + 364
30 PyQt4.QtGui.so 0x0000000106d89f60 meth_QApplication_exec_(_object*, _object*) + 80
31 Python 0x00000001003ad15c PyEval_EvalFrameEx + 20492
32 Python 0x00000001003a7edd PyEval_EvalCodeEx + 1725
33 Python 0x0000000100333cbc function_call + 364
34 Python 0x000000010030e183 PyObject_Call + 99
35 Python 0x000000010031b4b6 instancemethod_call + 182
36 Python 0x000000010030e183 PyObject_Call + 99
37 Python 0x00000001003abf8c PyEval_EvalFrameEx + 15932
38 Python 0x00000001003afaa2 fast_function + 194
39 Python 0x00000001003ab381 PyEval_EvalFrameEx + 12849
40 Python 0x00000001003afaa2 fast_function + 194
41 Python 0x00000001003ab381 PyEval_EvalFrameEx + 12849
42 Python 0x00000001003afaa2 fast_function + 194
43 Python 0x00000001003ab381 PyEval_EvalFrameEx + 12849
44 Python 0x00000001003afaa2 fast_function + 194
45 Python 0x00000001003ab381 PyEval_EvalFrameEx + 12849
46 Python 0x00000001003a7edd PyEval_EvalCodeEx + 1725
47 Python 0x00000001003a7816 PyEval_EvalCode + 54
48 Python 0x00000001003d16c5 PyRun_SimpleStringFlags + 149
49 <redacted> 0x000000010000187d pyi_pylib_run_scripts + 237
50 <redacted> 0x0000000100015bdc main + 380
51 <redacted> 0x0000000100000d34 start + 52