Comment # 1 on bug 1173750 from Mathias Homann

(In reply to Mathias Homann from comment #0)
> the package usbguard as included in 15.2 is broken, the daemon segfaults on
> start as soon as the rules.d folder is used.
> 
> This has been fixed upstream in version 0.7.8, which is already packaged on
> obs in https://build.opensuse.org/package/show/hardware/usbguard
> 
> Please provide this version as update ASAP.

actually, I tried the 0.7.8 package from OBS and it crashes as well... but when
you manually start the daemon with the command from the .service file it works?