Pure virtual call when deleting QNetworkAccessManager

fdm.exe!google_breakpad::ExceptionHandler::HandlePureVirtualCall(void)	C++
VCRUNTIME140.dll!_purecall() Line 29	C++
Qt5Network.dll!QNetworkAccessCache::clear() Line 122	C++
Qt5Network.dll!QNetworkAccessCache::~QNetworkAccessCache() Line 112	C++
Qt5Network.dll!QNetworkAccessManagerPrivate::~QNetworkAccessManagerPrivate() Line 1812	C++
[External Code]	
[Inline Frame] Qt5Core.dll!QScopedPointerDeleter<QObjectData>::cleanup(QObjectData *) Line 60	C++
[Inline Frame] Qt5Core.dll!QScopedPointer<QObjectData,QScopedPointerDeleter<QObjectData> >::{dtor}() Line 107	C++
Qt5Core.dll!QObject::~QObject() Line 1044	C++
[External Code]	
[Inline Frame] Qt5Core.dll!qDeleteInEventHandler(QObject *) Line 4657	C++
Qt5Core.dll!QObject::event(QEvent * e) Line 1252	C++
Qt5Widgets.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e) Line 3702	C++
Qt5Widgets.dll!QApplication::notify(QObject * receiver, QEvent * e) Line 3529	C++
Qt5Core.dll!QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) Line 1088	C++
[Inline Frame] Qt5Core.dll!QCoreApplication::sendEvent(QObject *) Line 1476	C++
Qt5Core.dll!QCoreApplicationPrivate::sendPostedEvents(QObject * receiver, int event_type, QThreadData * data) Line 1825	C++
Qt5Core.dll!qt_internal_proc(HWND__ * hwnd, unsigned int message, unsigned __int64 wp, __int64 lp) Line 247	C++
[External Code]	
Qt5Core.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 637	C++
[Inline Frame] Qt5Core.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 138	C++
Qt5Core.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 225	C++
Qt5Core.dll!QThread::exec() Line 531	C++
Qt5Core.dll!QThreadPrivate::start(void * arg) Line 405	C++
[External Code]