https://bugs.kde.org/show_bug.cgi?id=482048

Jakob Petsovits <jpe...@petsovits.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
                 CC|                            |jpe...@petsovits.com
             Status|REPORTED                    |CONFIRMED

--- Comment #10 from Jakob Petsovits <jpe...@petsovits.com> ---
> systemsettings[28428]: kcm_mouse: Not able to select appropriate backend.

That's coming from this line in kcm_mouse:
https://invent.kde.org/plasma/plasma-desktop/-/blob/master/kcms/mouse/kcm/configplugin.cpp#L22

Which in turn is used by ConfigContainer, the thing that currently provides the
system settings page:
https://invent.kde.org/plasma/plasma-desktop/-/blob/master/kcms/mouse/kcm/configcontainer.cpp#L27

When ConfigContainer::load() is called, it uses its ConfigPlugin without
nullptr checks, crashing the KCM. It should probably have an early return in
load(), save() and defaults(), closer to what kcm_touchpad is doing:
https://invent.kde.org/plasma/plasma-desktop/-/blob/master/kcms/touchpad/kcm/touchpadconfig.cpp#L94

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