zjes/lxqt-appswitcher: crash and core dump due to usage on virtual desktop without windows

backtrace.txt

#0  0x000000000040aee3 in AppModel::data(QModelIndex const&, int) const ()
#1  0x000000000040ac68 in AppSwitcher::keyReleaseEvent(QKeyEvent*) ()
#2  0x00007f00ad4929c8 in QWidget::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#3  0x00007f00ad5917be in QFrame::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#4  0x00007f00ad616173 in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#5  0x00007f00ad6b70bb in QAbstractItemView::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#6  0x00007f00ad44f9ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#7  0x00007f00ad456a73 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#8  0x00007f00acb5cbab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#9  0x00007f00ad4af4e3 in ?? () from /usr/lib/libQt5Widgets.so.5
#10 0x00007f00ad44f9ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#11 0x00007f00ad454e86 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#12 0x00007f00acb5cbab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#13 0x00007f00ace9a20e in QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) () from /usr/lib/libQt5Gui.so.5
#14 0x00007f00ace9f295 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) ()
from /usr/lib/libQt5Gui.so.5
#15 0x00007f00ace846d8 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#16 0x00007f00a323b8c0 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#17 0x00007f00aabaedc7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007f00aabaf020 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x00007f00aabaf0cc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#20 0x00007f00acbb354f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#21 0x00007f00acb5a57a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#22 0x00007f00acb6253c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#23 0x000000000040995b in main ()

stack-trace.txt

Process 2629 (lxqt-appswitche) of user 1002 dumped core.

Stack trace of thread 2629:
#0  0x000000000040aee3 _ZNK8AppModel4dataERK11QModelIndexi (lxqt-appswitcher)
#1  0x000000000040ac68 _ZN11AppSwitcher15keyReleaseEventEP9QKeyEvent (lxqt-appswitcher)
#2  0x00007f00ad4929c8 _ZN7QWidget5eventEP6QEvent (libQt5Widgets.so.5)
#3  0x00007f00ad5917be _ZN6QFrame5eventEP6QEvent (libQt5Widgets.so.5)
#4  0x00007f00ad616173 _ZN19QAbstractScrollArea5eventEP6QEvent (libQt5Widgets.so.5)
#5  0x00007f00ad6b70bb _ZN17QAbstractItemView5eventEP6QEvent (libQt5Widgets.so.5)
#6  0x00007f00ad44f9ac _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
#7  0x00007f00ad456a73 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
#8  0x00007f00acb5cbab _ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent (libQt5Core.so.5)
#9  0x00007f00ad4af4e3 n/a (libQt5Widgets.so.5)
#10 0x00007f00ad44f9ac _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
#11 0x00007f00ad454e86 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
#12 0x00007f00acb5cbab _ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent (libQt5Core.so.5)
#13 0x00007f00ace9a20e _ZN22QGuiApplicationPrivate15processKeyEventEPN29QWindowSystemInterfacePrivate8KeyEventE (libQt5Gui.so.5)
#14 0x00007f00ace9f295 _ZN22QGuiApplicationPrivate24processWindowSystemEventEPN29QWindowSystemInterfacePrivate17WindowSystemEventE (libQt5Gui.so.5)
#15 0x00007f00ace846d8 _ZN22QWindowSystemInterface22sendWindowSystemEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Gui.so.5)
#16 0x00007f00a323b8c0 n/a (libQt5XcbQpa.so.5)
#17 0x00007f00aabaedc7 g_main_context_dispatch (libglib-2.0.so.0)
#18 0x00007f00aabaf020 n/a (libglib-2.0.so.0)
#19 0x00007f00aabaf0cc g_main_context_iteration (libglib-2.0.so.0)
#20 0x00007f00acbb354f _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
#21 0x00007f00acb5a57a _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
#22 0x00007f00acb6253c _ZN16QCoreApplication4execEv (libQt5Core.so.5)
#23 0x000000000040995b main (lxqt-appswitcher)
#24 0x00007f00abfba610 __libc_start_main (libc.so.6)
#25 0x0000000000409ae9 _start (lxqt-appswitcher)

Stack trace of thread 2633:
#0  0x00007f00ac079e5d poll (libc.so.6)
#1  0x00007f00ab4efae2 n/a (libxcb.so.1)
#2  0x00007f00ab4f1757 xcb_wait_for_event (libxcb.so.1)
#3  0x00007f00a320a379 n/a (libQt5XcbQpa.so.5)
#4  0x00007f00ac97bb8e n/a (libQt5Core.so.5)
#5  0x00007f00ab0cc4a4 start_thread (libpthread.so.0)
#6  0x00007f00ac082dcd __clone (libc.so.6)