QtWebKit <select> items causes crash

I reproduced this bug with QtCrator 3.0.1 default HTML5 VIEWER example. I edited default index.html and added
<select>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>

If you click on the dropdown list (like if you want to select another item) but then click outside of it (because you don't want to make any change for example), it will cause a crash.

Stack trace (project zip attached) here:
0 QComboBox::hidePopup() QComboBox::hidePopup() 0x10169fdd4
1 QComboBoxPrivateContainer::mousePressEvent(QMouseEvent*) QComboBoxPrivateContainer::mousePressEvent(QMouseEvent*) 0x10169aace
2 QWidget::event(QEvent*) QWidget::event(QEvent*) 0x1015eb3fa
3 QFrame::event(QEvent*) QFrame::event(QEvent*) 0x1016c98c7
4 QApplicationPrivate::notify_helper(QObject*, QEvent*) QApplicationPrivate::notify_helper(QObject*, QEvent*) 0x1015b2f2c
5 QApplication::notify(QObject*, QEvent*) QApplication::notify(QObject*, QEvent*) 0x1015b64d9
6 QCoreApplication::notifyInternal(QObject*, QEvent*) QCoreApplication::notifyInternal(QObject*, QEvent*) 0x100c1a0b2
7 QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) 0x1015b3898
8 QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent(QGraphicsSceneMouseEvent*) QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent(QGraphicsSceneMouseEvent*) 0x101877774
9 QGraphicsItem::sceneEvent(QEvent*) QGraphicsItem::sceneEvent(QEvent*) 0x10185d6ef
10 non-virtual thunk to QGraphicsWidget::sceneEvent(QEvent*) non-virtual thunk to QGraphicsWidget::sceneEvent(QEvent*) 0x1018b50e9
11 QGraphicsScenePrivate::sendEvent(QGraphicsItem*, QEvent*) QGraphicsScenePrivate::sendEvent(QGraphicsItem*, QEvent*) 0x1018827f7
12 QGraphicsScenePrivate::sendMouseEvent(QGraphicsSceneMouseEvent*) QGraphicsScenePrivate::sendMouseEvent(QGraphicsSceneMouseEvent*) 0x10188418c
13 QGraphicsScenePrivate::mousePressEventHandler(QGraphicsSceneMouseEvent*) QGraphicsScenePrivate::mousePressEventHandler(QGraphicsSceneMouseEvent*) 0x10188430b
14 QGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent*) QGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent*) 0x10188e2aa
15 QGraphicsScene::event(QEvent*) QGraphicsScene::event(QEvent*) 0x101889a5b
16 QApplicationPrivate::notify_helper(QObject*, QEvent*) QApplicationPrivate::notify_helper(QObject*, QEvent*) 0x1015b2f2c
17 QApplication::notify(QObject*, QEvent*) QApplication::notify(QObject*, QEvent*) 0x1015b5a1d
18 QCoreApplication::notifyInternal(QObject*, QEvent*) QCoreApplication::notifyInternal(QObject*, QEvent*) 0x100c1a0b2
19 qt_sendSpontaneousEvent(QObject*, QEvent*) qt_sendSpontaneousEvent(QObject*, QEvent*) 0x1015b720c
20 QGraphicsView::mousePressEvent(QMouseEvent*) QGraphicsView::mousePressEvent(QMouseEvent*) 0x1018affce
21 QWidget::event(QEvent*) QWidget::event(QEvent*) 0x1015eb3fa
22 QFrame::event(QEvent*) QFrame::event(QEvent*) 0x1016c98c7
23 QAbstractScrollArea::viewportEvent(QEvent*) QAbstractScrollArea::viewportEvent(QEvent*) 0x101746fba
24 QGraphicsView::viewportEvent(QEvent*) QGraphicsView::viewportEvent(QEvent*) 0x1018aeeaa
25 QAbstractScrollAreaFilter::eventFilter(QObject*, QEvent*) QAbstractScrollAreaFilter::eventFilter(QObject*, QEvent*) 0x101747ab5
26 QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) 0x100c1a3ac
27 QApplicationPrivate::notify_helper(QObject*, QEvent*) QApplicationPrivate::notify_helper(QObject*, QEvent*) 0x1015b2f19
28 QApplication::notify(QObject*, QEvent*) QApplication::notify(QObject*, QEvent*) 0x1015b64d9
29 QCoreApplication::notifyInternal(QObject*, QEvent*) QCoreApplication::notifyInternal(QObject*, QEvent*) 0x100c1a0b2
30 QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) 0x1015b3898
31 QWidgetWindow::handleMouseEvent(QMouseEvent*) QWidgetWindow::handleMouseEvent(QMouseEvent*) 0x101608fb5
32 QWidgetWindow::event(QEvent*) QWidgetWindow::event(QEvent*) 0x1016082df
33 QApplicationPrivate::notify_helper(QObject*, QEvent*) QApplicationPrivate::notify_helper(QObject*, QEvent*) 0x1015b2f2c
34 QApplication::notify(QObject*, QEvent*) QApplication::notify(QObject*, QEvent*) 0x1015b5a1d
35 QCoreApplication::notifyInternal(QObject*, QEvent*) QCoreApplication::notifyInternal(QObject*, QEvent*) 0x100c1a0b2
36 QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) 0x10100efa2
37 QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) 0x10100e2e1
38 QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) 0x100ffe338
39 QCocoaEventDispatcherPrivate::processPostedEvents() QCocoaEventDispatcherPrivate::processPostedEvents() 0x10711a4c7
40 QCocoaEventDispatcherPrivate::postedEventsSourceCallback(void*) QCocoaEventDispatcherPrivate::postedEventsSourceCallback(void*) 0x10711afd8
41 _CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION_ _CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION_ 0x7fff8bee0731
42 __CFRunLoopDoSources0 __CFRunLoopDoSources0 0x7fff8bed1ea2
43 __CFRunLoopRun __CFRunLoopRun 0x7fff8bed162f
44 CFRunLoopRunSpecific CFRunLoopRunSpecific 0x7fff8bed10b5
45 RunCurrentEventLoopInMode RunCurrentEventLoopInMode 0x7fff8a8d1a0d
46 ReceiveNextEventCommon ReceiveNextEventCommon 0x7fff8a8d1685
47 _BlockUntilNextEventMatchingListInModeWithFilter _BlockUntilNextEventMatchingListInModeWithFilter 0x7fff8a8d15bc
48 _DPSNextEvent _DPSNextEvent 0x7fff8f46b3de
49 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] 0x7fff8f46aa2b
50 -[NSApplication run] -[NSApplication run] 0x7fff8f45eb2c
51 QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) 0x107119d44
52 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) 0x100c1764d
53 QCoreApplication::exec() QCoreApplication::exec() 0x100c1a652
54 main main.cpp 13 0x100005dce
55 start start 0x100005d04