[REG 3.2.2 -> 3.3.0] Crash when closing project

0	ProjectExplorer::ProjectExplorerPlugin::unloadProject	projectexplorer.cpp	1299	0x551a7ae3	
1	ProjectExplorer::ProjectExplorerPlugin::unloadProject	projectexplorer.cpp	1280	0x551a77a6	
2	ProjectExplorer::ProjectExplorerPlugin::qt_static_metacall	moc_projectexplorer.cpp	530	0x55387520	
3	QMetaObject::activate	qobject.cpp	3716	0x56774920	
4	QMetaObject::activate	qobject.cpp	3582	0x56774331	
5	QAction::triggered	moc_qaction.cpp	360	0x5a57af3b	
6	QAction::qt_static_metacall	moc_qaction.cpp	201	0x5a57a81f	
7	QMetaObject::activate	qobject.cpp	3716	0x56774920	
8	QMetaObject::activate	qobject.cpp	3582	0x56774331	
9	QAction::triggered	moc_qaction.cpp	360	0x5a57af3b	
10	QAction::activate	qaction.cpp	1168	0x5a57a617	
11	QMenuPrivate::activateCausedStack	qmenu.cpp	1004	0x5a78eb80	
12	QMenuPrivate::activateAction	qmenu.cpp	1082	0x5a78ee32	
13	QMenu::mouseReleaseEvent	qmenu.cpp	2403	0x5a792171	
14	QWidget::event	qwidget.cpp	8657	0x5a5e63a6	
15	QMenu::event	qmenu.cpp	2516	0x5a79272a	
16	QApplicationPrivate::notify_helper	qapplication.cpp	3722	0x5a59569e	
17	QApplication::notify	qapplication.cpp	3280	0x5a5938a8	
18	QCoreApplication::notifyInternal	qcoreapplication.cpp	932	0x56722b04	
19	QCoreApplication::sendSpontaneousEvent	qcoreapplication.h	231	0x568415a8	
...	<More>