Crash when switching items in Designer

This crash only happens when Creator was built on Qt 5.5. (I used 5.5.0 beta 1). It's probably a bug in Qt, not in Creator but I don't know the code well enough to get to a minimal example. Could you please have a look and forward the report to Qt if needed? Thanks!

1. Open a simple QML file in the Designer:

   import QtQuick 2.4
   import QtQuick.Window 2.2
   
   Window {
       visible: true
   
       MouseArea {
           anchors.fill: parent
           onClicked: {
               Qt.quit();
           }
       }
   
       Text {
           text: qsTr("Hello World")
           anchors.centerIn: parent
       }
   }
   

2. In the Navigator view, click on the elements in the following order: Window, MouseArea, Text, MouseArea.
   Creator crashes after clicking MouseArea for the second time:

   0	CheckBytes	dbgheap.c	1696	0x5a10b2ce	
   1	_free_dbg_nolock	dbgheap.c	1357	0x5a10d2bc	
   2	_free_dbg	dbgheap.c	1265	0x5a10cffe	
   3	free	dbgfree.c	49	0x5a10e57e	
   4	QArrayData::deallocate	qarraydata.cpp	131	0x56a7b02d	
   5	QTypedArrayData<unsigned short>::deallocate	qarraydata.h	222	0x56a131d0	
   6	QString::~QString	qstring.h	1053	0x56a0e353	
   7	QV4::Heap::StringObject::StringObject	qv4stringobject.cpp	92	0x55b60407	
   8	QV4::MemoryManager::alloc<QV4::StringObject,QV4::ExecutionEngine *,QV4::Value>	qv4mm_p.h	117	0x55afb164	
   9	QV4::ExecutionEngine::newStringObject	qv4engine.cpp	552	0x55aef45e	
   10	QV4::RuntimeHelpers::convertToObject	qv4runtime.cpp	440	0x55bc5f38	
   11	QV4::Runtime::getProperty	qv4runtime.cpp	679	0x55bc2c8c	
   12				0x20b705e0	
   13	QV4::SimpleScriptFunction::call	qv4functionobject.cpp	564	0x55b3d491	
   14	QV4::Object::call	qv4object_p.h	302	0x5595be2c	
   15	QQmlJavaScriptExpression::evaluate	qqmljavascriptexpression.cpp	158	0x55c813c0	
   16	QQmlJavaScriptExpression::evaluate	qqmljavascriptexpression.cpp	116	0x55c811a2	
   17	QQmlBinding::update	qqmlbinding.cpp	194	0x55c89dd3	
   18	QQmlBinding::setEnabled	qqmlbinding.cpp	305	0x55c89bd5	
   19	QQmlBinding::setEnabled	qqmlbinding.cpp	286	0x55c89b2d	
   20	QQmlAbstractBinding::setEnabled	qqmlabstractbinding_p.h	110	0x55a2f111	
   21	QQmlObjectCreator::finalize	qqmlobjectcreator.cpp	1196	0x55c9545b	
   22	QQmlIncubatorPrivate::incubate	qqmlincubator.cpp	348	0x55c0c31a	
   23	QQmlEnginePrivate::incubate	qqmlincubator.cpp	89	0x55c0bab3	
   24	QQmlComponent::create	qqmlcomponent.cpp	1069	0x55c05fdd	
   25	QQuickLoaderPrivate::_q_sourceLoaded	qquickloader.cpp	715	0x541dab86	
   26	QQuickLoaderPrivate::load	qquickloader.cpp	597	0x541da142	
   27	QQuickLoader::loadFromSource	qquickloader.cpp	426	0x541d9ae5	
   28	QQuickLoader::setSource	qquickloader.cpp	406	0x541d99d5	
   29	QQuickLoader::setSource	qquickloader.cpp	390	0x541d9365	
   30	QQuickLoader::qt_static_metacall	moc_qquickloader_p.cpp	249	0x541d8e32	
   31	QQuickLoader::qt_metacall	moc_qquickloader_p.cpp	301	0x541d8909	
   32	QMetaObject::metacall	qmetaobject.cpp	297	0x56cd2650	
   33	QQmlPropertyPrivate::write	qqmlproperty.cpp	1298	0x55c001c7	
   34	QQmlPropertyPrivate::writeValueProperty	qqmlproperty.cpp	1237	0x55bffe06	
   35	QQmlPropertyPrivate::writeBinding	qqmlproperty.cpp	1597	0x55c02733	
   36	QQmlBinding::update	qqmlbinding.cpp	199	0x55c89e61	
   37	QQmlBinding::update	qqmlbinding_p.h	97	0x55a2f4f9	
   38	QQmlBinding::expressionChanged	qqmlbinding.cpp	261	0x55c8a33c	
   39	QQmlJavaScriptExpressionGuard_callback	qqmljavascriptexpression.cpp	361	0x55c81b9e	
   40	QQmlNotifier::emitNotify	qqmlnotifier.cpp	73	0x55c5fa2c	
   41	QQmlData::signalEmitted	qqmlengine.cpp	751	0x55be63b8	
   42	QMetaObject::activate	qobject.cpp	3604	0x56d08b2f	
   43	QMetaObject::activate	qobject.cpp	3583	0x56d08a71	
   44	QmlDesigner::PropertyEditorContextObject::specificsUrlChanged	moc_propertyeditorcontextobject.cpp	423	0x50de9baa	
   45	QmlDesigner::PropertyEditorContextObject::setSpecificsUrl	propertyeditorcontextobject.cpp	191	0x50d53328	
   46	QmlDesigner::PropertyEditorQmlBackend::setup	propertyeditorqmlbackend.cpp	261	0x50d54706	
   47	QmlDesigner::PropertyEditorView::setupQmlBackend	propertyeditorview.cpp	423	0x50d40ebb	
   48	QmlDesigner::PropertyEditorView::resetView	propertyeditorview.cpp	349	0x50d3cf89	
   49	QmlDesigner::PropertyEditorView::timerEvent	propertyeditorview.cpp	329	0x50d3d810	
   50	QObject::event	qobject.cpp	1228	0x56d0a55b	
   51	QApplicationPrivate::notify_helper	qapplication.cpp	3717	0x581b5b6e	
   52	QApplication::notify	qapplication.cpp	3161	0x581b1f8e	
   53	QCoreApplication::notifyInternal	qcoreapplication.cpp	963	0x56cc73f7	
   54	QCoreApplication::sendEvent	qcoreapplication.h	224	0x56ccfb49	
   55	QEventDispatcherWin32Private::sendTimerEvent	qeventdispatcher_win.cpp	615	0x56d59e88	
   56	qt_internal_proc	qeventdispatcher_win.cpp	418	0x56d57abd	
   57	InternalCallWinProc	USER32		0x75c862fa	
   58	UserCallWinProcCheckWow	USER32		0x75c86d3a	
   59	DispatchMessageWorker	USER32		0x75c877c4	
   60	DispatchMessageW	USER32		0x75c8788a	
   61	QEventDispatcherWin32::processEvents	qeventdispatcher_win.cpp	807	0x56d585be	
   62	QWindowsGuiEventDispatcher::processEvents	qwindowsguieventdispatcher.cpp	73	0x566441dc	
   63	QEventLoop::processEvents	qeventloop.cpp	129	0x56cc316c	
   64	QEventLoop::exec	qeventloop.cpp	204	0x56cc3372	
   65	QCoreApplication::exec	qcoreapplication.cpp	1216	0x56cc5a22	
   66	QGuiApplication::exec	qguiapplication.cpp	1529	0x57a8fda8	
   67	QApplication::exec	qapplication.cpp	2978	0x581b1be9	
   68	main	main.cpp	521	0xa79aad	
   69	WinMain	qtmain_win.cpp	113	0xa7e77d	
   70	__tmainCRTStartup	crtexe.c	618	0xa7db1f	
   71	WinMainCRTStartup	crtexe.c	466	0xa7d8dd	
   72	BaseThreadInitThunk	kernel32		0x75d8337a	
   73	__RtlUserThreadStart	ntdll32		0x776292e2	
   74	_RtlUserThreadStart	ntdll32		0x776292b5