https://bugs.kde.org/show_bug.cgi?id=468952

--- Comment #7 from Waqar Ahmed <waqar....@gmail.com> ---
Here you go:

#0  0x00007ff739e4a8b9 in
QQuickWindowPrivate::queryPointerEventInstance(QQuickPointerDevice*,
QEvent::Type) const () at /usr/lib/libQt5Quick.so.5
#1  0x00007ff739e4acd9 in QQuickWindow::mouseGrabberItem() const () at
/usr/lib/libQt5Quick.so.5
#2  0x00007ff739e4e92f in QQuickWindowPrivate::removeGrabber(QQuickItem*, bool,
bool) () at /usr/lib/libQt5Quick.so.5
#3  0x00007ff739e319c5 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) ()
at /usr/lib/libQt5Quick.so.5
#4  0x00007ff739e319f8 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) ()
at /usr/lib/libQt5Quick.so.5
#5  0x00007ff739e319f8 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) ()
at /usr/lib/libQt5Quick.so.5
#6  0x00007ff739e319f8 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) ()
at /usr/lib/libQt5Quick.so.5
#7  0x00007ff739e319f8 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) ()
at /usr/lib/libQt5Quick.so.5
#8  0x00007ff739e319f8 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) ()
at /usr/lib/libQt5Quick.so.5
#9  0x00007ff739e319f8 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) ()
at /usr/lib/libQt5Quick.so.5
#10 0x00007ff739e319f8 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) ()
at /usr/lib/libQt5Quick.so.5
#11 0x00007ff739e319f8 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) ()
at /usr/lib/libQt5Quick.so.5
#12 0x00007ff739e31b39 in QQuickItemPrivate::setVisible(bool) () at
/usr/lib/libQt5Quick.so.5
#13 0x00007ff739e3fd43 in QQuickItem::qt_metacall(QMetaObject::Call, int,
void**) () at /usr/lib/libQt5Quick.so.5
#14 0x00007ff73ade4fcd in
PlasmaQuick::AppletQuickItem::qt_metacall(QMetaObject::Call, int, void**)
(this=0x56429ff82530, _c=QMetaObject::WriteProperty, _id=12, _a=0x7ffd97cf9050)
    at KF5PlasmaQuick_autogen/include/moc_appletquickitem.cpp:364
#15 0x00007ff72bfb98fd in AppletInterface::qt_metacall(QMetaObject::Call, int,
void**) (this=0x56429ff82530, _c=QMetaObject::WriteProperty, _id=12,
_a=0x7ffd97cf9050)
    at
plasma_appletscript_declarative_autogen/include/moc_appletinterface.cpp:887
#16 0x00007ff72bfd12cd in ContainmentInterface::qt_metacall(QMetaObject::Call,
int, void**) (this=0x56429ff82530, _c=QMetaObject::WriteProperty, _id=12,
_a=0x7ffd97cf9050)
    at
plasma_appletscript_declarative_autogen/include/moc_containmentinterface.cpp:459
#17 0x00007ff73983c823 in  () at /usr/lib/libQt5Qml.so.5
#18 0x00007ff7397752f2 in
QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*,
QQmlPropertyData*, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#19 0x00007ff739775876 in
QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*,
QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&)
()
    at /usr/lib/libQt5Qml.so.5
#20 0x00007ff7397759d7 in QV4::QObjectWrapper::virtualPut(QV4::Managed*,
QV4::PropertyKey, QV4::Value const&, QV4::Value*) () at /usr/lib/libQt5Qml.so.5
#21 0x00007ff739723a75 in QV4::Lookup::setterFallback(QV4::Lookup*,
QV4::ExecutionEngine*, QV4::Value&, QV4::Value const&) () at
/usr/lib/libQt5Qml.so.5
#22 0x00007ff73978eaff in  () at /usr/lib/libQt5Qml.so.5
#23 0x00007ff739794804 in  () at /usr/lib/libQt5Qml.so.5
#24 0x00007ff739736c36 in QV4::Function::call(QV4::Value const*, QV4::Value
const*, int, QV4::ExecutionContext const*) () at /usr/lib/libQt5Qml.so.5
#25 0x00007ff7398971ad in QQmlJavaScriptExpression::evaluate(QV4::CallData*,
bool*) () at /usr/lib/libQt5Qml.so.5
#26 0x00007ff7398537f1 in QQmlBoundSignalExpression::evaluate(void**) () at
/usr/lib/libQt5Qml.so.5
#27 0x00007ff73985476c in  () at /usr/lib/libQt5Qml.so.5
#28 0x00007ff73987647f in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*,
void**) () at /usr/lib/libQt5Qml.so.5
#29 0x00007ff737abe740 in  () at /usr/lib/libQt5Core.so.5
#30 0x00007ff739831fcb in QQmlVMEMetaObject::metaCall(QObject*,
QMetaObject::Call, int, void**) () at /usr/lib/libQt5Qml.so.5
#31 0x00007ff737a9ea0c in QMetaProperty::write(QObject*, QVariant const&) const
() at /usr/lib/libQt5Core.so.5
#32 0x00007ff737abaf52 in QObject::setProperty(char const*, QVariant const&) ()
at /usr/lib/libQt5Core.so.5
#33 0x00007ff73ae025b8 in
PlasmaQuick::ContainmentViewPrivate::setContainment(Plasma::Containment*)
(this=0x5642a0968bd0, cont=0x56429ff74c70)
    at
/home/waqar/kde/src/frameworks/plasma-framework/src/plasmaquick/containmentview.cpp:124
#34 0x00007ff73ae03361 in
PlasmaQuick::ContainmentView::setContainment(Plasma::Containment*)
(this=0x5642a0f9e500, cont=0x56429ff74c70)
    at
/home/waqar/kde/src/frameworks/plasma-framework/src/plasmaquick/containmentview.cpp:251
#35 0x000056429f2d337a in ShellCorona::createWaitingPanels()
(this=0x56429f958880) at
/home/waqar/kde/src/plasma/plasma-workspace/shell/shellcorona.cpp:1488
#36 0x000056429f2f93d8 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>,
QtPrivate::List<>, void, void (ShellCorona::*)()>::call(void
(ShellCorona::*)(), ShellCorona*, void**)
    (f=(void (ShellCorona::*)(ShellCorona * const)) 0x56429f2d2f40
<ShellCorona::createWaitingPanels()>, o=0x56429f958880, arg=0x7ffd97cfbae0) at
/usr/include/qt/QtCore/qobjectdefs_impl.h:152
#37 0x000056429f2f933d in QtPrivate::FunctionPointer<void
(ShellCorona::*)()>::call<QtPrivate::List<>, void>(void (ShellCorona::*)(),
ShellCorona*, void**)
    (f=(void (ShellCorona::*)(ShellCorona * const)) 0x56429f2d2f40
<ShellCorona::createWaitingPanels()>, o=0x56429f958880, arg=0x7ffd97cfbae0) at
/usr/include/qt/QtCore/qobjectdefs_impl.h:185
--Type <RET> for more, q to quit, c to continue without paging--
#38 0x000056429f2f9282 in QtPrivate::QSlotObject<void (ShellCorona::*)(),
QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*,
void**, bool*)
    (which=1, this_=0x56429f981560, r=0x56429f958880, a=0x7ffd97cfbae0,
ret=0x0) at /usr/include/qt/QtCore/qobjectdefs_impl.h:418
#39 0x00007ff737abea71 in  () at /usr/lib/libQt5Core.so.5
#40 0x00007ff737ac0fcf in QTimer::timeout(QTimer::QPrivateSignal) () at
/usr/lib/libQt5Core.so.5
#41 0x00007ff737ab1b56 in QObject::event(QEvent*) () at
/usr/lib/libQt5Core.so.5
#42 0x00007ff738978b5c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /usr/lib/libQt5Widgets.so.5
#43 0x00007ff737a8df48 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /usr/lib/libQt5Core.so.5
#44 0x00007ff737ad84b3 in QTimerInfoList::activateTimers() () at
/usr/lib/libQt5Core.so.5
#45 0x00007ff737ad8af2 in  () at /usr/lib/libQt5Core.so.5
#46 0x00007ff736ada53b in g_main_context_dispatch () at
/usr/lib/libglib-2.0.so.0
#47 0x00007ff736b37219 in  () at /usr/lib/libglib-2.0.so.0
#48 0x00007ff736ad91a2 in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0
#49 0x00007ff737ad8c6c in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#50 0x00007ff737a866ec in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#51 0x00007ff737a91219 in QCoreApplication::exec() () at
/usr/lib/libQt5Core.so.5
#52 0x000056429f29febc in main(int, char**) (argc=2, argv=0x7ffd97cfc7e8) at
/home/waqar/kde/src/plasma/plasma-workspace/shell/main.cpp:236

This is latest kf5/plasma-5.27

I reproduce by just plugging/unplugging the external display.

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