systemsettings(14714)/(default) qt_assert: ASSERT: "value.isString()" in file jsruntime/qv4runtime.cpp, line 439

Program received signal SIGABRT, Aborted.
0x00007ffff28e7107 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56      ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007ffff28e7107 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007ffff28e84e8 in __GI_abort () at abort.c:89
#2  0x00007ffff35d2291 in qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1578
#3  0x00007ffff35ce95c in QMessageLogger::fatal (this=0x7fffffff3920, msg=0x7ffff38ee270 "ASSERT: \"%s\" in file %s, line %d") at global/qlogging.cpp:781
#4  0x00007ffff35c7b90 in qt_assert (assertion=0x7ffff1f9276a "value.isString()", file=0x7ffff1f92710 "jsruntime/qv4runtime.cpp", line=439) at global/qglobal.cpp:2966
#5  0x00007ffff1ddb5eb in QV4::RuntimeHelpers::convertToObject (engine=0x139a400, value=...) at jsruntime/qv4runtime.cpp:439
#6  0x00007ffff1ddcc6e in QV4::Runtime::getProperty (engine=0x139a400, object=..., nameIndex=136) at jsruntime/qv4runtime.cpp:682
#7  0x00007ffff1dca362 in QV4::Moth::VME::run (this=0x7fffffff41d7, engine=0x139a400, code=0x7fffcc15f830 "\357\230\334\361\377\177", storeJumpTable=0x0) at jsruntime/qv4vme_moth.cpp:487
#8  0x00007ffff1dce656 in QV4::Moth::VME::exec (engine=0x139a400, code=0x7fffcc15f6c8 "\366\251\334\361\377\177") at jsruntime/qv4vme_moth.cpp:925
#9  0x00007ffff1d58eb3 in QV4::SimpleScriptFunction::call (that=0x7fffd3424010, callData=0x7fffd3424018) at jsruntime/qv4functionobject.cpp:564
#10 0x00007ffff1c93e14 in QV4::Object::call (this=0x7fffd3424010, d=0x7fffd3424018) at ../../include/QtQml/5.5.1/QtQml/private/../../../../../src/qml/jsruntime/qv4object_p.h:305
#11 0x00007ffff1e93cac in QQmlJavaScriptExpression::evaluate (this=0x2b7a690, context=0x1392ad0, function=..., callData=0x7fffd3424018, isUndefined=0x7fffffff4553) at qml/qqmljavascriptexpression.cpp:158
#12 0x00007ffff1e939a5 in QQmlJavaScriptExpression::evaluate (this=0x2b7a690, context=0x1392ad0, function=..., isUndefined=0x7fffffff4553) at qml/qqmljavascriptexpression.cpp:116
#13 0x00007ffff1e9c484 in QQmlBinding::update (this=0x2b7a670, flags=...) at qml/qqmlbinding.cpp:194
#14 0x00007ffff1e9cfac in QQmlBinding::update (this=0x2b7a670) at qml/qqmlbinding_p.h:97
#15 0x00007ffff1e9cab2 in QQmlBinding::expressionChanged (e=0x2b7a690) at qml/qqmlbinding.cpp:260
#16 0x00007ffff1e94d67 in QQmlJavaScriptExpressionGuard_callback (e=0x15ddbb0) at qml/qqmljavascriptexpression.cpp:361
#17 0x00007ffff1e72d0f in QQmlNotifier::emitNotify (endpoint=0x0, a=0x0) at qml/qqmlnotifier.cpp:94
#18 0x00007ffff1dfb3f6 in QQmlData::signalEmitted (object=0x33914f0, index=30, a=0x0) at qml/qqmlengine.cpp:763
#19 0x00007ffff384d31e in QMetaObject::activate (sender=0x33914f0, signalOffset=29, local_signal_index=1, argv=0x0) at kernel/qobject.cpp:3599
#20 0x00007ffff1df7906 in QQmlVMEMetaObject::activate (this=0x3391720, object=0x33914f0, index=44, args=0x0) at qml/qqmlvmemetaobject.cpp:1325
#21 0x00007ffff1df5436 in QQmlVMEMetaObject::metaCall (this=0x3391720, c=QMetaObject::WriteProperty, _id=42, a=0x7fffffff6860) at qml/qqmlvmemetaobject.cpp:841
#22 0x00007ffff1bb7432 in QAbstractDynamicMetaObject::metaCall (this=0x3391720, c=QMetaObject::WriteProperty, _id=42, a=0x7fffffff6860)
    at /home/martin/src/qt5/qtbase/include/QtCore/5.5.1/QtCore/private/../../../../../src/corelib/kernel/qobject_p.h:421
#23 0x00007ffff1df5e91 in QQmlVMEMetaObject::metaCall (this=0x2ca1900, c=QMetaObject::WriteProperty, _id=42, a=0x7fffffff6860) at qml/qqmlvmemetaobject.cpp:969
#24 0x00007ffff1bb7432 in QAbstractDynamicMetaObject::metaCall (this=0x2ca1900, c=QMetaObject::WriteProperty, _id=42, a=0x7fffffff6860)
    at /home/martin/src/qt5/qtbase/include/QtCore/5.5.1/QtCore/private/../../../../../src/corelib/kernel/qobject_p.h:421
#25 0x00007ffff3817ce1 in QMetaObject::metacall (object=0x33914f0, cl=QMetaObject::WriteProperty, idx=42, argv=0x7fffffff6860) at kernel/qmetaobject.cpp:294
#26 0x00007ffff1e14605 in QQmlPropertyPrivate::write (object=0x33914f0, property=..., value=..., context=0x3391390, flags=...) at qml/qqmlproperty.cpp:1308
#27 0x00007ffff1e13f47 in QQmlPropertyPrivate::writeValueProperty (object=0x33914f0, core=..., value=..., context=0x3391390, flags=...) at qml/qqmlproperty.cpp:1237
#28 0x00007ffff1e163ab in QQmlPropertyPrivate::writeBinding (object=0x33914f0, core=..., context=0x3391390, expression=0x3391bd0, result=..., isUndefined=false, flags=...) at qml/qqmlproperty.cpp:1597
#29 0x00007ffff1e9c567 in QQmlBinding::update (this=0x3391bb0, flags=...) at qml/qqmlbinding.cpp:198
#30 0x00007ffff1e9cfac in QQmlBinding::update (this=0x3391bb0) at qml/qqmlbinding_p.h:97
#31 0x00007ffff1e9cab2 in QQmlBinding::expressionChanged (e=0x3391bd0) at qml/qqmlbinding.cpp:260
#32 0x00007ffff1e94d67 in QQmlJavaScriptExpressionGuard_callback (e=0x15dd948) at qml/qqmljavascriptexpression.cpp:361
#33 0x00007ffff1e72d0f in QQmlNotifier::emitNotify (endpoint=0x0, a=0x0) at qml/qqmlnotifier.cpp:94
#34 0x00007ffff1dfb3f6 in QQmlData::signalEmitted (object=0x3391fc0, index=31, a=0x0) at qml/qqmlengine.cpp:763
#35 0x00007ffff384d31e in QMetaObject::activate (sender=0x3391fc0, signalOffset=31, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3599
#36 0x00007ffff384d120 in QMetaObject::activate (sender=0x3391fc0, m=0x7ffff2688b20 <QQuickLoader::staticMetaObject>, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3578
#37 0x00007ffff2432687 in QQuickLoader::itemChanged (this=0x3391fc0) at .moc/moc_qquickloader_p.cpp:321
#38 0x00007ffff2431370 in QQuickLoaderPrivate::incubatorStateChanged (this=0x2ca0700, status=QQmlIncubator::Ready) at items/qquickloader.cpp:666
#39 0x00007ffff24312e4 in QQuickLoaderIncubator::statusChanged (this=0x30f9e70, status=QQmlIncubator::Ready) at items/qquickloader.cpp:654
#40 0x00007ffff1e1f2ea in QQmlIncubatorPrivate::changeStatus (this=0x30f9e90, s=QQmlIncubator::Ready) at qml/qqmlincubator.cpp:701
---Type <return> to continue, or q <return> to quit---
#41 0x00007ffff1e1eab7 in QQmlIncubatorPrivate::incubate (this=0x30f9e90, i=...) at qml/qqmlincubator.cpp:368
#42 0x00007ffff1e1dd0e in QQmlEnginePrivate::incubate (this=0x13882d0, i=..., forContext=0x30f9db0) at qml/qqmlincubator.cpp:87
#43 0x00007ffff1e1a6d3 in QQmlComponent::create (this=0x15bfe90, incubator=..., context=0x2ca7160, forContext=0x0) at qml/qqmlcomponent.cpp:1068
#44 0x00007ffff24317a4 in QQuickLoaderPrivate::_q_sourceLoaded (this=0x2ca0700) at items/qquickloader.cpp:714
#45 0x00007ffff2430f10 in QQuickLoaderPrivate::load (this=0x2ca0700) at items/qquickloader.cpp:597
#46 0x00007ffff24319bf in QQuickLoader::componentComplete (this=0x3391fc0) at items/qquickloader.cpp:806
#47 0x00007ffff1ead859 in QQmlObjectCreator::finalize (this=0x31869c0, interrupt=...) at qml/qqmlobjectcreator.cpp:1207
#48 0x00007ffff1e1a094 in QQmlComponentPrivate::complete (enginePriv=0x13882d0, state=0x30b89a0) at qml/qqmlcomponent.cpp:928
#49 0x00007ffff1e1a17c in QQmlComponentPrivate::completeCreate (this=0x30b8900) at qml/qqmlcomponent.cpp:964
#50 0x00007ffff1e1a12c in QQmlComponent::completeCreate (this=0x1544040) at qml/qqmlcomponent.cpp:957
#51 0x00007ffff1e19953 in QQmlComponent::create (this=0x1544040, context=0x2bdd5f0) at qml/qqmlcomponent.cpp:791
#52 0x00007ffff24396e6 in QQuickView::continueExecute (this=0x134d440) at items/qquickview.cpp:476
#53 0x00007ffff2438617 in QQuickViewPrivate::execute (this=0x15c38c0) at items/qquickview.cpp:124
#54 0x00007ffff2438a2c in QQuickView::setSource (this=0x134d440, url=...) at items/qquickview.cpp:253
#55 0x00007fffd5c20a65 in KWin::Compositing::EffectView::init (this=0x134d440, type=KWin::Compositing::EffectView::DesktopEffectsView) at /home/martin/src/kf5/kde/workspace/kwin/kcmkwin/kwincompositing/model.cpp:613
#56 0x00007fffd5c207a8 in KWin::Compositing::EffectView::EffectView (this=0x134d440, type=KWin::Compositing::EffectView::DesktopEffectsView, parent=0x0) at /home/martin/src/kf5/kde/workspace/kwin/kcmkwin/kwincompositing/model.cpp:592
#57 0x00007fffd5c3072e in KWinCompositingKCM::KWinCompositingKCM (this=0x1381fc0, parent=0x2c9f620, args=..., viewType=KWin::Compositing::EffectView::DesktopEffectsView)
    at /home/martin/src/kf5/kde/workspace/kwin/kcmkwin/kwincompositing/main.cpp:259
#58 0x00007fffd5c35a25 in KWinDesktopEffects::KWinDesktopEffects (this=0x1381fc0, parent=0x2c9f620, args=...) at /home/martin/src/kf5/kde/workspace/kwin/kcmkwin/kwincompositing/main.cpp:56
#59 0x00007fffd5c367c7 in KPluginFactory::createInstance<KWinDesktopEffects, QWidget> (parentWidget=0x0, parent=0x2c9f620, args=...) at /opt/kf5/include/KF5/KCoreAddons/kpluginfactory.h:477
#60 0x00007ffff3ba76ce in KPluginFactory::create (this=0x1385870, iface=0x7ffff69c92c8 <qt_meta_stringdata_KCModule+360> "KCModule", parentWidget=0x0, parent=0x2c9f620, args=..., keyword=...)
    at /home/martin/src/kf5/frameworks/kcoreaddons/src/lib/plugin/kpluginfactory.cpp:145
#61 0x00007ffff7981cfb in KPluginFactory::create<KCModule> (this=0x1385870, parentWidget=0x0, parent=0x2c9f620, keyword=..., args=...) at /opt/kf5/include/KF5/KCoreAddons/kpluginfactory.h:519
#62 0x00007ffff79817d7 in KService::createInstance<KCModule> (this=0x869230, parentWidget=0x0, parent=0x2c9f620, args=..., error=0x7fffffff9b20) at /opt/kf5/include/KF5/KService/kservice.h:526
#63 0x00007ffff79812b8 in KService::createInstance<KCModule> (this=0x869230, parent=0x2c9f620, args=..., error=0x7fffffff9b20) at /opt/kf5/include/KF5/KService/kservice.h:501
#64 0x00007ffff797fe5f in KCModuleLoader::loadModule (mod=..., report=KCModuleLoader::Inline, parent=0x2c9f620, args=...) at /home/martin/src/kf5/frameworks/kcmutils/src/kcmoduleloader.cpp:92
#65 0x00007ffff79894f2 in KCModuleProxyPrivate::loadModule (this=0x14e8ae0) at /home/martin/src/kf5/frameworks/kcmutils/src/kcmoduleproxy.cpp:109
#66 0x00007ffff798908a in KCModuleProxy::realModule (this=0x2c9f620) at /home/martin/src/kf5/frameworks/kcmutils/src/kcmoduleproxy.cpp:82
#67 0x00007ffff7989d30 in KCModuleProxy::showEvent (this=0x2c9f620, ev=0x7fffffffabf0) at /home/martin/src/kf5/frameworks/kcmutils/src/kcmoduleproxy.cpp:195
#68 0x00007ffff5105f0d in QWidget::event (this=0x2c9f620, event=0x7fffffffabf0) at kernel/qwidget.cpp:8890
#69 0x00007ffff50b6616 in QApplicationPrivate::notify_helper (this=0x648dc0, receiver=0x2c9f620, e=0x7fffffffabf0) at kernel/qapplication.cpp:3716
#70 0x00007ffff50b6474 in QApplication::notify (this=0x7fffffffdb90, receiver=0x2c9f620, e=0x7fffffffabf0) at kernel/qapplication.cpp:3681
#71 0x00007ffff380ef9e in QCoreApplication::notifyInternal (this=0x7fffffffdb90, receiver=0x2c9f620, event=0x7fffffffabf0) at kernel/qcoreapplication.cpp:965
#72 0x00007ffff50a6af7 in QCoreApplication::sendEvent (receiver=0x2c9f620, event=0x7fffffffabf0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#73 0x00007ffff5103166 in QWidgetPrivate::show_helper (this=0x148a380) at kernel/qwidget.cpp:7819
#74 0x00007ffff5102b7e in QWidgetPrivate::show_recursive (this=0x148a380) at kernel/qwidget.cpp:7690
#75 0x00007ffff51044e2 in QWidgetPrivate::showChildren (this=0x30a5ea0, spontaneous=false) at kernel/qwidget.cpp:8186
#76 0x00007ffff5102fb1 in QWidgetPrivate::show_helper (this=0x30a5ea0) at kernel/qwidget.cpp:7766
#77 0x00007ffff510404a in QWidget::setVisible (this=0x135a5b0, visible=true) at kernel/qwidget.cpp:8105
#78 0x00007ffff5102a7f in QWidget::show (this=0x135a5b0) at kernel/qwidget.cpp:7667
#79 0x00007ffff51044f0 in QWidgetPrivate::showChildren (this=0x31852d0, spontaneous=false) at kernel/qwidget.cpp:8188
#80 0x00007ffff5102fb1 in QWidgetPrivate::show_helper (this=0x31852d0) at kernel/qwidget.cpp:7766
#81 0x00007ffff510404a in QWidget::setVisible (this=0x15ce160, visible=true) at kernel/qwidget.cpp:8105
---Type <return> to continue, or q <return> to quit---
#82 0x00007ffff5102a7f in QWidget::show (this=0x15ce160) at kernel/qwidget.cpp:7667
#83 0x00007ffff50e9484 in QStackedLayout::setCurrentIndex (this=0x7a7280, index=2) at kernel/qstackedlayout.cpp:319
#84 0x00007ffff50e9695 in QStackedLayout::setCurrentWidget (this=0x7a7280, widget=0x15ce160) at kernel/qstackedlayout.cpp:374
#85 0x00007ffff52a7c44 in QStackedWidget::setCurrentWidget (this=0x7701c0, widget=0x15ce160) at widgets/qstackedwidget.cpp:244
#86 0x00007ffff5852c09 in KPageViewPrivate::_k_pageSelected (this=0x12719c0, index=..., previous=...) at /home/martin/src/kf5/frameworks/kwidgetsaddons/src/kpageview.cpp:246
#87 0x00007ffff5853aa7 in KPageView::qt_static_metacall (_o=0x860980, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0x7fffffffb420) at /opt/build/kf5/frameworks/kwidgetsaddons/src/moc_kpageview.cpp:115
#88 0x00007ffff384d915 in QMetaObject::activate (sender=0x1370ba0, signalOffset=3, local_signal_index=0, argv=0x7fffffffb420) at kernel/qobject.cpp:3713
#89 0x00007ffff384d120 in QMetaObject::activate (sender=0x1370ba0, m=0x7ffff3b02680 <QItemSelectionModel::staticMetaObject>, local_signal_index=0, argv=0x7fffffffb420) at kernel/qobject.cpp:3578
#90 0x00007ffff37c5467 in QItemSelectionModel::selectionChanged (this=0x1370ba0, _t1=..., _t2=...) at .moc/moc_qitemselectionmodel.cpp:473
#91 0x00007ffff37c41e0 in QItemSelectionModel::emitSelectionChanged (this=0x1370ba0, newSelection=..., oldSelection=...) at itemmodels/qitemselectionmodel.cpp:1857
#92 0x00007ffff37c17a2 in QItemSelectionModel::select (this=0x1370ba0, selection=..., command=...) at itemmodels/qitemselectionmodel.cpp:1288
#93 0x00007ffff585724a in KDEPrivate::SelectionModel::select (this=0x1370ba0, selection=..., command=...) at /home/martin/src/kf5/frameworks/kwidgetsaddons/src/kpageview_p.cpp:631
#94 0x00007ffff53b7c58 in QListView::setSelection (this=0x87b470, rect=..., command=...) at itemviews/qlistview.cpp:1352
#95 0x00007ffff5392d7d in QAbstractItemView::mousePressEvent (this=0x87b470, event=0x7fffffffc9a0) at itemviews/qabstractitemview.cpp:1733
#96 0x00007ffff5105331 in QWidget::event (this=0x87b470, event=0x7fffffffc9a0) at kernel/qwidget.cpp:8671
#97 0x00007ffff523612d in QFrame::event (this=0x87b470, e=0x7fffffffc9a0) at widgets/qframe.cpp:540
#98 0x00007ffff52d5aa6 in QAbstractScrollArea::viewportEvent (this=0x87b470, e=0x7fffffffc9a0) at widgets/qabstractscrollarea.cpp:1200
#99 0x00007ffff5392868 in QAbstractItemView::viewportEvent (this=0x87b470, event=0x7fffffffc9a0) at itemviews/qabstractitemview.cpp:1685
#100 0x00007ffff52d6d53 in QAbstractScrollAreaPrivate::viewportEvent (this=0x1380b50, event=0x7fffffffc9a0) at widgets/qabstractscrollarea_p.h:102
#101 0x00007ffff52d6e1c in QAbstractScrollAreaFilter::eventFilter (this=0x1485b50, o=0x13a0130, e=0x7fffffffc9a0) at widgets/qabstractscrollarea_p.h:118
#102 0x00007ffff380f31b in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x648dc0, receiver=0x13a0130, event=0x7fffffffc9a0) at kernel/qcoreapplication.cpp:1072
#103 0x00007ffff50b65ed in QApplicationPrivate::notify_helper (this=0x648dc0, receiver=0x13a0130, e=0x7fffffffc9a0) at kernel/qapplication.cpp:3712
#104 0x00007ffff50b4590 in QApplication::notify (this=0x7fffffffdb90, receiver=0x13a0130, e=0x7fffffffc9a0) at kernel/qapplication.cpp:3276
#105 0x00007ffff380ef9e in QCoreApplication::notifyInternal (this=0x7fffffffdb90, receiver=0x13a0130, event=0x7fffffffc9a0) at kernel/qcoreapplication.cpp:965
#106 0x00007ffff50b95f1 in QCoreApplication::sendSpontaneousEvent (receiver=0x13a0130, event=0x7fffffffc9a0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#107 0x00007ffff50b2fa9 in QApplicationPrivate::sendMouseEvent (receiver=0x13a0130, event=0x7fffffffc9a0, alienWidget=0x13a0130, nativeWidget=0x87b470, buttonDown=0x7ffff5748730 <qt_button_down>, lastMouseReceiver=..., 
    spontaneous=true) at kernel/qapplication.cpp:2770
#108 0x00007ffff5130673 in QWidgetWindow::handleMouseEvent (this=0x139dc10, event=0x7fffffffd580) at kernel/qwidgetwindow.cpp:555
#109 0x00007ffff512f386 in QWidgetWindow::event (this=0x139dc10, event=0x7fffffffd580) at kernel/qwidgetwindow.cpp:210
#110 0x00007ffff50b6616 in QApplicationPrivate::notify_helper (this=0x648dc0, receiver=0x139dc10, e=0x7fffffffd580) at kernel/qapplication.cpp:3716
#111 0x00007ffff50b3d75 in QApplication::notify (this=0x7fffffffdb90, receiver=0x139dc10, e=0x7fffffffd580) at kernel/qapplication.cpp:3160
#112 0x00007ffff380ef9e in QCoreApplication::notifyInternal (this=0x7fffffffdb90, receiver=0x139dc10, event=0x7fffffffd580) at kernel/qcoreapplication.cpp:965
#113 0x00007ffff4953ee9 in QCoreApplication::sendSpontaneousEvent (receiver=0x139dc10, event=0x7fffffffd580) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#114 0x00007ffff494cff0 in QGuiApplicationPrivate::processMouseEvent (e=0x14e99c0) at kernel/qguiapplication.cpp:1789
#115 0x00007ffff494c58a in QGuiApplicationPrivate::processWindowSystemEvent (e=0x14e99c0) at kernel/qguiapplication.cpp:1581
#116 0x00007ffff4934c65 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#117 0x00007fffe8d8ad42 in userEventSourceDispatch (source=0x6968c0) at eventdispatchers/qeventdispatcher_glib.cpp:70
#118 0x00007fffebf8bfe7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#119 0x00007fffebf8c240 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#120 0x00007fffebf8c2ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#121 0x00007ffff38850d9 in QEventDispatcherGlib::processEvents (this=0x693c50, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#122 0x00007fffe8d8af66 in QPAEventDispatcherGlib::processEvents (this=0x693c50, flags=...) at eventdispatchers/qeventdispatcher_glib.cpp:115
#123 0x00007ffff380bb5c in QEventLoop::processEvents (this=0x7fffffffdab0, flags=...) at kernel/qeventloop.cpp:128
---Type <return> to continue, or q <return> to quit---
#124 0x00007ffff380be50 in QEventLoop::exec (this=0x7fffffffdab0, flags=...) at kernel/qeventloop.cpp:204
#125 0x00007ffff380f67c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#126 0x00007ffff494c3ba in QGuiApplication::exec () at kernel/qguiapplication.cpp:1527
#127 0x00007ffff50b374f in QApplication::exec () at kernel/qapplication.cpp:2976
#128 0x000000000042582c in main ()

Reproducible: Always

Steps to Reproduce:
1. open systemsettings
2. Desktop Behavior
3. Desktop Effects
4. All Settings
4. repeat steps 2 and 3


Actual Results:  
Crash

Expected Results:  
no crash

run with 
QV4_NO_SSA=1 QV4_NO_OPT=1 QV4_FORCE_INTERPRETER=1 QML_DISABLE_OPTIMIZER=1

to get better result. Possible related Qt bug: https://bugreports.qt.io/browse/QTBUG-44895