***
If you're not sure this is actually a bug, instead post about it at https://discuss.kde.org

If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports

Please remove this comment after reading and before submitting - thanks!
***

SUMMARY


STEPS TO REPRODUCE
1. navigate to settings -> Configure Kontact...
2. close the configuration window using the close button
3. repeat steps 1 and 2 (alternatively, close the Kontact main window using the close button)

OBSERVED RESULT
the application crashes due to a segmentation fault

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Gentoo Linux
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.21.0
Qt Version: 6.10.1

ADDITIONAL INFORMATION

When closing the configuration window, the function KontactKCMultiDialog::closeEvent deletes all KCModules currently held, after which the window gets hidden. When reopening it, the previously deleted KCModules are not recreated. The next activation of  KontactKCMultiDialog::closeEvent triggers a NULL pointer dereference by attempting to remove the already deleted KCModules once again.