[24.04-1.x] attempt to lock screen from system indicator crashes Lomiri

Steps to reproduce: Go the "System-Tab" from the indicator-menu and select "Lock".

Expected behaviour: Screen gets locked and you have to enter the password/PIN to unlock the screen again.

Actual behaviour: Lomiri seems to crash and restarts. After that, the indicator-menu does have other entries than before and for example under "System-Tab" you can only select "Shutdown".

Tested under 24.04 devel with Vollaphone 22.