[REG] Crash in QWidgetPrivate::setParent_sys() when nativeParent->d_func()->extra is NULL

0	QList<QPointer<QWidget> >::QList<QPointer<QWidget> >	qlist.h	122	0x650754b8	
1	QForeachContainer<QList<QPointer<QWidget> > >::QForeachContainer<QList<QPointer<QWidget> > >	qglobal.h	2394	0x65075439	
2	qForeachContainerNew<QList<QPointer<QWidget> > >	qglobal.h	2404	0x65075395	
3	QWidgetPrivate::setParent_sys	qwidget_win.cpp	636	0x6506e9ca	
4	QWidget::setParent	qwidget.cpp	10215	0x64ff775b	
5	QWidget::setParent	qwidget.cpp	10161	0x64ff743f	
6	QFocusFramePrivate::update	qfocusframe.cpp	73	0x65749c7e	
7	QFocusFrame::setWidget	qfocusframe.cpp	235	0x657493f3	
8	WMDialog::setErrorWidget	WMDialog.cpp	327	0x14354ffd9	
9	ControlPropertiesDialog::generateCommand	ControlPropertiesDialog.cpp	539	0x143a51b43	
10	WMCmdGenDialog::updateCommand	WMCmdGenDialog.cpp	547	0x14353a9b9	
11	ControlPropertiesDialog::_updateDialogState	ControlPropertiesDialog.cpp	869	0x143a53230	
12	ControlPropertiesDialog::qt_static_metacall	moc_ControlPropertiesDialog.cpp	66	0x145bc0bfb	
13	QMetaObject::activate	qobject.cpp	3539	0x64bca799	
14	QTimer::timeout	moc_qtimer.cpp	142	0x64c686d0	
15	QTimer::timerEvent	qtimer.cpp	282	0x64be1935	
16	QObject::event	qobject.cpp	1157	0x64bcc183	
17	QApplicationPrivate::notify_helper	qapplication.cpp	4562	0x64f5bb06	
18	QApplication::notify	qapplication.cpp	3944	0x64f564f5	
19	IgorAppObject::notify	IgorAppObject.cpp	537	0x1432c7f50	
20	QCoreApplication::notifyInternal	qcoreapplication.cpp	953	0x64ba985a	
21	QCoreApplication::sendEvent	qcoreapplication.h	231	0x64bb23d3	
22	QEventDispatcherWin32::event	qeventdispatcher_win.cpp	1151	0x64bff7db	
23	QApplicationPrivate::notify_helper	qapplication.cpp	4562	0x64f5bb06	
24	QApplication::notify	qapplication.cpp	3944	0x64f564f5	
25	IgorAppObject::notify	IgorAppObject.cpp	537	0x1432c7f50	
26	QCoreApplication::notifyInternal	qcoreapplication.cpp	953	0x64ba985a	
27	QCoreApplication::sendEvent	qcoreapplication.h	231	0x64bb23d3	
28	QCoreApplicationPrivate::sendPostedEvents	qcoreapplication.cpp	1577	0x64baa964	
29	qt_internal_proc	qeventdispatcher_win.cpp	498	0x64bfdad4	
30	UserCallWinProcCheckWow	USER32		0x77849bd1	
31	DispatchMessageWorker	USER32		0x778498da	
32	QEventDispatcherWin32::processEvents	qeventdispatcher_win.cpp	823	0x64bfe588	
33	QGuiEventDispatcherWin32::processEvents	qapplication_win.cpp	1212	0x65049c55	
34	QEventLoop::processEvents	qeventloop.cpp	150	0x64ba55b4	
35	QEventLoop::exec	qeventloop.cpp	204	0x64ba5897	
36	QDialog::exec	qdialog.cpp	563	0x6579fc9d	
37	WMDialog::runDialog	WMDialog.cpp	1144	0x143550476	
38	IgorAppObject::runWMDialogVariant	IgorAppObject.cpp	2660	0x1432cb7db	
39	BuiltinActions::doCommand	BuiltinActions.cpp	3906	0x1432de9ed	
40	BuiltinActions::doCommandFromSender	BuiltinActions.cpp	702	0x1432df165	
41	BuiltinActions::qt_static_metacall	moc_BuiltinActions.cpp	69	0x145b94fb8	
42	QMetaObject::activate	qobject.cpp	3539	0x64bca799	
43	QAction::triggered	moc_qaction.cpp	271	0x64f2a51d	
44	QAction::activate	qaction.cpp	1262	0x64f2994d	
45	QMenuPrivate::activateCausedStack	qmenu.cpp	1040	0x656d99ad	
46	QMenuPrivate::activateAction	qmenu.cpp	1133	0x656d989d	
47	QMenu::mouseReleaseEvent	qmenu.cpp	2373	0x656d2b28	
48	QWidget::event	qwidget.cpp	8377	0x64ffaa16	
49	QMenu::event	qmenu.cpp	2482	0x656d47fd	
50	QApplicationPrivate::notify_helper	qapplication.cpp	4562	0x64f5bb06	
51	QApplication::notify	qapplication.cpp	4105	0x64f56e33	
52	IgorAppObject::notify	IgorAppObject.cpp	537	0x1432c7f50	
53	QCoreApplication::notifyInternal	qcoreapplication.cpp	953	0x64ba985a	
54	QCoreApplication::sendSpontaneousEvent	qcoreapplication.h	234	0x64c730fc	
55	QApplicationPrivate::sendMouseEvent	qapplication.cpp	3171	0x64f5d9d6	
56	QETWidget::translateMouseEvent	qapplication_win.cpp	3295	0x650455fc	
57	QtWndProc	qapplication_win.cpp	1709	0x65040e01	
58	UserCallWinProcCheckWow	USER32		0x77849bd1	
59	DispatchMessageWorker	USER32		0x778498da	
60	QEventDispatcherWin32::processEvents	qeventdispatcher_win.cpp	823	0x64bfe588	
61	QGuiEventDispatcherWin32::processEvents	qapplication_win.cpp	1212	0x65049c55	
62	QEventLoop::processEvents	qeventloop.cpp	150	0x64ba55b4	
63	QEventLoop::exec	qeventloop.cpp	204	0x64ba5897	
64	QCoreApplication::exec	qcoreapplication.cpp	1225	0x64ba78dc	
65	QApplication::exec	qapplication.cpp	3824	0x64f56108	
66	main	IgorQtMain.cpp	497	0x145b86228	
67	WinMain	Igor64		0x145d311b1	
68	__tmainCRTStartup	crtexe.c	618	0x145d307b1	
69	WinMainCRTStartup	crtexe.c	466	0x145d3052e	
70	BaseThreadInitThunk	kernel32		0x7772652d	
71	RtlUserThreadStart	ntdll		0x7795c541	

if (QWidget *nativeParent = q->internalWinId() ? q : q->nativeParentWidget()) {
    foreach (QWidget *w, nativeParent->d_func()->extra->oleDropWidgets) {
        if (w && q->isAncestorOf(w)) {
            registeredDropChildren.push_back(w);
            w->setAttribute(Qt::WA_DropSiteRegistered, false);
        }
    }
}