(gdb) bt
#0 0x00007f3793427751 in QGraphicsScene::views() const (this=0x0) at graphicsview/qgraphicsscene.cpp:3232
#1 0x00007f379312f528 in QWidget::mapFromGlobal(QPoint const&) const (this=0x7f3797f971a0, pos=...) at kernel/qwidget.cpp:12294
#2 0x00007f379665f6bd in () at /usr/lib/x86_64-linux-gnu/libQt5WebKitWidgets.so.5
#3 0x00007f3793f873de in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#4 0x00007f37942c37f8 in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#5 0x00007f37942c38b2 in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#6 0x00007f37942a5d7c in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#7 0x00007f37942a4bc6 in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#8 0x00007f37942a4dcd in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#9 0x00007f379428aea4 in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#10 0x00007f37942d0d49 in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#11 0x00007f37942d0ef8 in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#12 0x00007f37944edfb1 in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#13 0x00007f37944eb0f8 in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#14 0x00007f37944edb8b in () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#15 0x00007f3796282959 in QMetaObject::activate(QObject*, int, int, void**) (sender=sender@entry=0x7f3797b8f350, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3716
#16 0x00007f3796282fe7 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x7f3797b8f350, m=m@entry=0x7f37924a8d60 <QNetworkReply::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0)
at kernel/qobject.cpp:3582
#17 0x00007f379245c583 in QNetworkReply::finished() (this=this@entry=0x7f3797b8f350) at .moc/moc_qnetworkreply.cpp:320
#18 0x00007f37923d3d8c in QNetworkReplyHttpImplPrivate::finished() (this=0x7f3797b8f710) at access/qnetworkreplyhttpimpl.cpp:1962
#19 0x00007f379245d569 in QNetworkReplyHttpImpl::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=0x7f3797b8f350, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x248) at .moc/moc_qnetworkreplyhttpimpl_p.cpp:228
#20 0x00007f37962836ca in QObject::event(QEvent*) (this=0x7f3797b8f350, e=<optimized out>) at kernel/qobject.cpp:1245
#21 0x00007f37930fc2ec in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=0x7f379742cc80, receiver=0x7f3797b8f350, e=0x7f36700051b0) at kernel/qapplication.cpp:3722
#22 0x00007f3793101960 in QApplication::notify(QObject*, QEvent*) (this=0x7fffb8fb1520, receiver=0x7f3797b8f350, e=0x7f36700051b0) at kernel/qapplication.cpp:3505
#23 0x00007f3796251bdb in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7fffb8fb1520, receiver=0x7f3797b8f350, event=event@entry=0x7f36700051b0) at kernel/qcoreapplication.cpp:932
#24 0x00007f3796253c4b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (event=0x7f36700051b0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#25 0x00007f3796253c4b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x7f3797428380) at kernel/qcoreapplication.cpp:1536
#26 0x00007f3796254248 in QCoreApplication::sendPostedEvents(QObject*, int) (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1394
#27 0x00007f37962aa6a3 in postEventSourceDispatch(GSource*, GSourceFunc, gpointer) (s=0x7f379753a930) at kernel/qeventdispatcher_glib.cpp:271
#28 0x00007f37909d0ecd in g_main_context_dispatch (context=0x7f377c0016f0) at /build/buildd/glib2.0-2.43.3/./glib/gmain.c:3122
#29 0x00007f37909d0ecd in g_main_context_dispatch (context=context@entry=0x7f377c0016f0) at /build/buildd/glib2.0-2.43.3/./glib/gmain.c:3737
#30 0x00007f37909d11b0 in g_main_context_iterate (context=context@entry=0x7f377c0016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.43.3/./glib/gmain.c:3808
#31 0x00007f37909d125c in g_main_context_iteration (context=0x7f377c0016f0, may_block=1) at /build/buildd/glib2.0-2.43.3/./glib/gmain.c:3869
#32 0x00007f37962aaab7 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f3797519960, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#33 0x00007f379624f392 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fffb8fb1490, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#34 0x00007f3796256fdc in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1185
#35 0x00007f3796823708 in main ()