Backtrace of the crash I experienced:

Application: إعدادات النظام (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f9ab5169800 (LWP 22612))]

Thread 5 (Thread 0x7f9aa0221700 (LWP 22613)):
#0  0x00007f9ab0e7a18d in poll () from /usr/lib/libc.so.6
#1  0x00007f9aadc14ae2 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f9aadc16757 in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007f9aa2799e89 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f9ab157b96e in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007f9aad3944a4 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f9ab0e8313d in clone () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7f9a8e0ad700 (LWP 22615)):
#0  0x00007f9aace76938 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#1  0x00007f9aace76f60 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f9aace770cc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f9ab17b336b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007f9ab175a37a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f9ab15769c4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007f9a905cbdb7 in KCupsConnection::run() () from /usr/lib/libkcupslib.so
#7  0x00007f9ab157b96e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007f9aad3944a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007f9ab0e8313d in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7f9a87fff700 (LWP 22616)):
#0  0x00007f9ab0e8f6bf in __libc_enable_asynccancel () from /usr/lib/libc.so.6
#1  0x00007f9ab0e7a182 in poll () from /usr/lib/libc.so.6
#2  0x00007f9aace76fbc in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007f9aace770cc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#4  0x00007f9aace77109 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007f9aace9d715 in ?? () from /usr/lib/libglib-2.0.so.0
#6  0x00007f9aad3944a4 in start_thread () from /usr/lib/libpthread.so.0
#7  0x00007f9ab0e8313d in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f9a877fe700 (LWP 22617)):
#0  0x00007f9ab0e7616d in read () from /usr/lib/libc.so.6
#1  0x00007f9aa88d3f75 in ?? () from /usr/lib/tls/libnvidia-tls.so.352.55
#2  0x00007f9aaceba270 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007f9aace76aa4 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#4  0x00007f9aace76f60 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007f9aace77342 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#6  0x00007f9a8cade246 in ?? () from /usr/lib/libgio-2.0.so.0
#7  0x00007f9aace9d715 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007f9aad3944a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007f9ab0e8313d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f9ab5169800 (LWP 22612)):
[KCrash Handler]
#5  0x00007f9aaffae732 in QQuickItemPrivate::addToDirtyList() () from /usr/lib/libQt5Quick.so.5
#6  0x00007f9aaffae7d3 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/libQt5Quick.so.5
#7  0x00007f9aaffbb71d in ?? () from /usr/lib/libQt5Quick.so.5
#8  0x00007f9ab178bff1 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#9  0x00007f9aaffb880b in QQuickItem::event(QEvent*) () from /usr/lib/libQt5Quick.so.5
#10 0x00007f9ab32fd01c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#11 0x00007f9ab33024f6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#12 0x00007f9ab175c9ab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#13 0x00007f9ab175eda6 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#14 0x00007f9ab17b2f43 in ?? () from /usr/lib/libQt5Core.so.5
#15 0x00007f9aace76dc7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0x00007f9aace77020 in ?? () from /usr/lib/libglib-2.0.so.0
#17 0x00007f9aace770cc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#18 0x00007f9ab17b334f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#19 0x00007f9ab175a37a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#20 0x00007f9ab176233c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#21 0x000000000040eeab in main ()


Reproducible: Always