Comment # 3 on bug 1086804 from Thorsten Kukuk

(In reply to Marguerite Su from comment #2)
> Hi, Thorsten,
> 
> can you please tell which package triggered this error?
> 
> I installed latest fonts-config in a clean environment, and I can't
> reproduce this error.

Most likely you had an HOME variable set? Which is the default if you run it
from a shell, but not if the run was triggered by something like a systemd
service.

To reproduce, unset the HOME environment variable, that should be the easiest
way. Else write a systemd service, which updates or runs fonts-config.