Hi

I reported the crash to KDE bugtracker, a dev said the problem occurs in qtWayland.

https://bugs.kde.org/show_bug.cgi?id=386309

 
Relevant part of the backtrace for duplication searches:

#0 0x00007fffe23c0f35 in QtWaylandClient::QWaylandXdgSurfaceV6::setType(Qt::WindowType, QtWaylandClient::QWaylandWindow*) () from /usr/lib64/libQt5WaylandClient.so.5
#1 0x00007fffe23bcbbe in QtWaylandClient::QWaylandWindow::initWindow() ()
from /usr/lib64/libQt5WaylandClient.so.5
#2 0x00007fffe23bd1ca in QtWaylandClient::QWaylandWindow::setVisible(bool) ()
from /usr/lib64/libQt5WaylandClient.so.5
#3 0x00007fffd602ae64 in QtWaylandClient::QWaylandEglWindow::setVisible(bool) ()
from /usr/lib64/qt5/plugins/wayland-graphics-integration-client/libwayland-egl.so
#4 0x00007ffff2eb2760 in QWindowPrivate::setVisible(bool) () from /usr/lib64/libQt5Gui.so.5
#5 0x00007ffff36d52a6 in QWidgetPrivate::show_sys() () from /usr/lib64/libQt5Widgets.so.5
#6 0x00007ffff36ddbf0 in QWidgetPrivate::show_helper() () from /usr/lib64/libQt5Widgets.so.5
#7 0x00007ffff36e0b4b in QWidget::setVisible(bool) () from /usr/lib64/libQt5Widgets.so.5
#8 0x00007ffff387e56c in QDialog::setVisible(bool) () from /usr/lib64/libQt5Widgets.so.5
#9 0x00007ffff387dca3 in QDialog::exec() () from /usr/lib64/libQt5Widgets.so.5