Crash after Warning: QPaintDevice: Cannot destroy paint device that is being painted

I do not have reproducible example. My app crashed at user site. I can see warning in logs

Warning: QPaintDevice: Cannot destroy paint device that is being painted

and I can give you stack trace

The access denied exception triggered in qpainter.cpp line 664 and it was triggered in size changed event. I use shaddow efect in my app. Probable it is it. 

//this is in constructor of the class, I do nothing with it after this

m_shadow = new QGraphicsDropShadowEffect(this);

m_shadow->setBlurRadius(5);

m_shadow->setOffset(1);

m_ui->widget_titleBar->setGraphicsEffect(m_shadow);

 
Qt5Gui!QPainterPrivate::updateMatrix
664
c:\users\qt\work\qt\qtbase\src\gui\painting\qpainter.cpp
 
Qt5Widgets!QGraphicsDropShadowEffect::draw
1068
c:\users\qt\work\qt\qtbase\src\widgets\effects\qgraphicseffect.cpp
 
Qt5Widgets!QWidgetPrivate::drawWidget(class QPaintDevice * pdev = 0x000001a94e0fcb68
 
Qt5Widgets!QWidgetPrivate::paintSiblingsRecursive
5604
c:\users\qt\work\qt\qtbase\src\widgets\kernel\qwidget.cpp
 
Qt5Widgets!QWidgetPrivate::drawWidget
5466
c:\users\qt\work\qt\qtbase\src\widgets\kernel\qwidget.cpp
 
Qt5Widgets!QWidgetRepaintManager::paintAndFlush
1020
c:\users\qt\work\qt\qtbase\src\widgets\kernel\qwidgetrepaintmanager.cpp
 
Qt5Widgets!QWidgetWindow::handleResizeEvent
820
c:\users\qt\work\qt\qtbase\src\widgets\kernel\qwidgetwindow.cpp
 
Qt5Widgets!QWidgetWindow::event
318
c:\users\qt\work\qt\qtbase\src\widgets\kernel\qwidgetwindow.cpp
 
Qt5Widgets!QApplicationPrivate::notify_helper
3686
c:\users\qt\work\qt\qtbase\src\widgets\kernel\qapplication.cpp
 
Qt5Widgets!QApplication::notify
3638
c:\users\qt\work\qt\qtbase\src\widgets\kernel\qapplication.cpp
 
Qt5Core!QCoreApplication::notifyInternal2
1092
c:\users\qt\work\qt\qtbase\src\corelib\kernel\qcoreapplication.cpp
 
Qt5Gui!QGuiApplicationPrivate::processGeometryChangeEvent
2536
c:\users\qt\work\qt\qtbase\src\gui\kernel\qguiapplication.cpp
 
Qt5Gui!QWindowSystemInterface::sendWindowSystemEvents
1169
c:\users\qt\work\qt\qtbase\src\gui\kernel\qwindowsysteminterface.cpp
 
Qt5Gui!QWindowSystemInterface::flushWindowSystemEvents
1129
c:\users\qt\work\qt\qtbase\src\gui\kernel\qwindowsysteminterface.cpp
 
qwindows!QWindowsWindow::handleGeometryChange
1976
c:\users\qt\work\qt\qtbase\src\plugins\platforms\windows\qwindowswindow.cpp