Application has crashed after changing still loading component in async loader

#0  0x0000000000000000 in ?? ()
#1  0x00007ffff6d944d1 in operator<< (dbg=..., o=0x2e521a0) at kernel/qobject.cpp:4115
#2  0x0000000000403f67 in TestModel::clear (this=0x763030) at ../LoaderCrash/testmodel.cpp:40
#3  0x0000000000403988 in TestModel::~TestModel (this=0x763030, __in_chrg=<optimized out>) at ../LoaderCrash/testmodel.cpp:13
#4  0x00000000004037c6 in QQmlPrivate::QQmlElement<TestModel>::~QQmlElement (this=0x763030, __in_chrg=<optimized out>)
    at ../../qt5.6.2/qt5/qtbase/include/QtQml/../../../qtdeclarative/src/qml/qml/qqmlprivate.h:98
#5  0x00000000004037f6 in QQmlPrivate::QQmlElement<TestModel>::~QQmlElement (this=0x763030, __in_chrg=<optimized out>)
    at ../../qt5.6.2/qt5/qtbase/include/QtQml/../../../qtdeclarative/src/qml/qml/qqmlprivate.h:98
#6  0x00007ffff746989a in QQmlObjectCreator::clear (this=0x48e9060) at qml/qqmlobjectcreator.cpp:1278
#7  0x00007ffff73d95fe in QQmlIncubatorPrivate::clear (this=0x3b99060) at qml/qqmlincubator.cpp:176
#8  0x00007ffff73da2df in QQmlIncubator::clear (this=0x1e48bc0) at qml/qqmlincubator.cpp:568
#9  0x00007fffec7b0409 in QQuickLoaderPrivate::clear (this=0x75bb30) at items/qquickloader.cpp:87
#10 0x00007fffec7b0dcd in QQuickLoader::setSourceComponent (this=0x889150, comp=0x0) at items/qquickloader.cpp:463
#11 0x00007fffec7b0e81 in QQuickLoader::resetSourceComponent (this=0x889150) at items/qquickloader.cpp:480
#12 0x00007fffec7b2782 in QQuickLoader::qt_static_metacall (_o=0x889150, _c=QMetaObject::ResetProperty, _id=2, _a=0x7fffffffac40) at .moc/moc_qquickloader_p.cpp:266
#13 0x00007fffec7b28ed in QQuickLoader::qt_metacall (this=0x889150, _c=QMetaObject::ResetProperty, _id=2, _a=0x7fffffffac40) at .moc/moc_qquickloader_p.cpp:309
#14 0x00007ffff6d59d5d in QMetaObject::metacall (object=0x889150, cl=QMetaObject::ResetProperty, idx=45, argv=0x7fffffffac40) at kernel/qmetaobject.cpp:295
#15 0x00007ffff73713e1 in QV4::QObjectWrapper::setProperty (engine=0x6600e0, object=0x889150, property=0x7fffe404e608, value=...) at jsruntime/qv4qobjectwrapper.cpp:489
#16 0x00007ffff7372605 in QV4::QObjectWrapper::setProperty (engine=0x6600e0, object=0x889150, propertyIndex=45, value=...) at jsruntime/qv4qobjectwrapper.cpp:656
#17 0x00007ffff7372577 in QV4::QObjectWrapper::setProperty (this=0x7fffecab23f0, engine=0x6600e0, propertyIndex=45, value=...) at jsruntime/qv4qobjectwrapper.cpp:641
#18 0x00007ffff7399e10 in QV4::Runtime::setQmlQObjectProperty (engine=0x6600e0, object=..., propertyIndex=45, value=...) at jsruntime/qv4runtime.cpp:1456
#19 0x00007ffff737fa30 in QV4::Moth::VME::run (this=0x7fffffffb467, engine=0x6600e0, code=0x7fffe4059210 "\216<8\367\377\177", storeJumpTable=0x0) at jsruntime/qv4vme_moth.cpp:508
#20 0x00007ffff7384160 in QV4::Moth::VME::exec (engine=0x6600e0, code=0x7fffe4058ff8 "i\001\070\367\377\177") at jsruntime/qv4vme_moth.cpp:968
#21 0x00007ffff7308cf6 in QV4::SimpleScriptFunction::call (that=0x7fffec494040, callData=0x7fffecab2318) at jsruntime/qv4functionobject.cpp:576
#22 0x00007ffff728271a in QV4::Object::call (this=0x7fffec494040, d=0x7fffecab2318)
    at /home/user/work/source/qt5.6.2/qt5/qtbase/include/QtQml/5.6.2/QtQml/private/../../../../../../qtdeclarative/src/qml/jsruntime/qv4object_p.h:326
#23 0x00007ffff744f9d4 in QQmlJavaScriptExpression::evaluate (this=0x7724a0, callData=0x7fffecab2318, isUndefined=0x0) at qml/qqmljavascriptexpression.cpp:189
#24 0x00007ffff73e1701 in QQmlBoundSignalExpression::evaluate (this=0x7724a0, a=0x0) at qml/qqmlboundsignal.cpp:240
#25 0x00007ffff73e1c7c in QQmlBoundSignal_callback (e=0x888f30, a=0x0) at qml/qqmlboundsignal.cpp:357
#26 0x00007ffff742e018 in QQmlNotifier::emitNotify (endpoint=0x0, a=0x0) at qml/qqmlnotifier.cpp:94
#27 0x00007ffff73b75d0 in QQmlData::signalEmitted (object=0x80d970, index=3, a=0x0) at qml/qqmlengine.cpp:772
#28 0x00007ffff6d923fa in QMetaObject::activate (sender=0x80d970, signalOffset=3, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3616
#29 0x00007ffff6d9220a in QMetaObject::activate (sender=0x80d970, m=0x7ffff7686c40 <QQmlTimer::staticMetaObject>, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3595
#30 0x00007ffff74d2017 in QQmlTimer::triggered (this=0x80d970) at .moc/moc_qqmltimer_p.cpp:260
#31 0x00007ffff74bca84 in QQmlTimer::ticked (this=0x80d970) at types/qqmltimer.cpp:317
#32 0x00007ffff74bcaf4 in QQmlTimer::event (this=0x80d970, e=0x678415b0) at types/qqmltimer.cpp:329
#33 0x00007ffff6d51208 in QCoreApplicationPrivate::notify_helper (receiver=0x80d970, event=0x678415b0) at kernel/qcoreapplication.cpp:1149
#34 0x00007ffff6d50e7e in doNotify (receiver=0x80d970, event=0x678415b0) at kernel/qcoreapplication.cpp:1090
#35 0x00007ffff6d50de2 in QCoreApplication::notify (this=0x7fffffffd900, receiver=0x80d970, event=0x678415b0) at kernel/qcoreapplication.cpp:1076
#36 0x00007ffff779ba4a in QGuiApplication::notify (this=0x7fffffffd900, object=0x80d970, event=0x678415b0) at kernel/qguiapplication.cpp:1616
#37 0x00007ffff6d50d5f in QCoreApplication::notifyInternal2 (receiver=0x80d970, event=0x678415b0) at kernel/qcoreapplication.cpp:1015
#38 0x00007ffff6d54f60 in QCoreApplication::sendEvent (receiver=0x80d970, event=0x678415b0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:225
#39 0x00007ffff6d52157 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x60af10) at kernel/qcoreapplication.cpp:1650
#40 0x00007ffff6d51b18 in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1508
#41 0x00007ffff6dcff0b in postEventSourceDispatch (s=0x652460) at kernel/qeventdispatcher_glib.cpp:270
#42 0x00007ffff4de6197 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007ffff4de63f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007ffff4de649c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#45 0x00007ffff6dd06ec in QEventDispatcherGlib::processEvents (this=0x645e40, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#46 0x00007ffff1dc79a2 in QPAEventDispatcherGlib::processEvents (this=0x645e40, flags=...) at eventdispatchers/qeventdispatcher_glib.cpp:115
#47 0x00007ffff6d4dd58 in QEventLoop::processEvents (this=0x7fffffffd860, flags=...) at kernel/qeventloop.cpp:128
#48 0x00007ffff6d4e057 in QEventLoop::exec (this=0x7fffffffd860, flags=...) at kernel/qeventloop.cpp:206
#49 0x00007ffff6d51509 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1285
#50 0x00007ffff779b9fa in QGuiApplication::exec () at kernel/qguiapplication.cpp:1607
#51 0x0000000000402533 in main (argc=1, argv=0x7fffffffda28) at ../LoaderCrash/main.cpp:13