[apparmor] apparmor cache dir error messages

[mailinglisten at posteo.de]

I just discovered an apparmor error message in the logs and I have no
clue when this first appeared....

"apparmor.systemd (...) Cache: failed to add read only location
'/usr/share/apparmor/cache', does not contain valid cache directory"

/usr/share/apparmor/cache/ actually does exist and contains a 1 year old
subdirectory with profile files inside, as it seems.

Is this something to worry about?
Since this subdir in the cache is year old, I guess it´s safe to delete?

Thanks!