SUMMARY
I simply pressed the Prnt Scrn button on my keyboard and then the error message about drkonqi showed up.

Application: The KDE Crash Handler (drkonqi), signal: Segmentation fault

[KCrash Handler]
#4  wl_proxy_marshal_constructor (proxy=0x0, opcode=0, interface=0x7f94b8967640 <wl_surface_interface>) at ../src/wayland-client.c:829
#5  0x00007f94b88b1b57 in QtWaylandClient::QWaylandDisplay::createSurface (this=this@entry=0x7ffda9676678, handle=handle@entry=0x557c22d1be90) at qwaylanddisplay.cpp:96
#6  0x00007f94b88bdd7a in QtWaylandClient::QWaylandSurface::QWaylandSurface (this=0x557c22d1be90, display=0x7ffda9676678) at qwaylandsurface.cpp:51
#7  0x00007f94b88b675a in QtWaylandClient::QWaylandWindow::initializeWlSurface (this=0x557c22a1c340) at qwaylandwindow.cpp:213
#8  0x00007f94b88bd5ad in QtWaylandClient::QWaylandShmWindow::QWaylandShmWindow (this=0x557c22a1c340, window=<optimized out>, display=<optimized out>) at qwaylandshmwindow.cpp:53
#9  0x00007f94b88a4c39 in QtWaylandClient::QWaylandIntegration::createPlatformWindow (this=<optimized out>, window=0x557c22d1aa60) at qwaylandintegration.cpp:171
#10 0x00007f94ba3c71e4 in QWindowPrivate::create (this=0x557c22c2f0d0, recursive=recursive@entry=false, nativeHandle=nativeHandle@entry=0) at kernel/qwindow.cpp:528
#11 0x00007f94ba3c75c1 in QWindow::create (this=this@entry=0x557c22d1aa60) at kernel/qwindow.cpp:650
#12 0x00007f94bac15fa5 in QWidgetPrivate::create (this=this@entry=0x557c2272acb0) at kernel/qwidget.cpp:1314
#13 0x00007f94bac164ee in QWidget::create (this=0x557c22762810, window=<optimized out>, initializeWindow=<optimized out>, destroyOldWindow=<optimized out>) at kernel/qwidget.cpp:1179
#14 0x00007f94bac2377e in QWidgetPrivate::setVisible (this=0x557c2272acb0, visible=<optimized out>) at kernel/qwidget.cpp:8062
#15 0x00007f94bac23b86 in QWidget::setVisible (this=this@entry=0x557c22762810, visible=visible@entry=true) at kernel/qwidget.cpp:8043
#16 0x00007f94bade3868 in QDialog::setVisible (this=0x557c22762810, visible=<optimized out>) at dialogs/qdialog.cpp:787
#17 0x0000557c21e356e0 in main (argc=<optimized out>, argv=<optimized out>) at ./src/main.cpp:219
[Inferior 1 (process 16049) detached]


SOFTWARE/OS VERSIONS
Operating System: Kubuntu 21.04
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-17-generic
OS Type: 64-bit
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i5-8250U CPU @ 1.60GHz
Memory: 7,6 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620