squid-deb-proxy crashing

I had a problem with squid-deb-proxy crashing. I could see this in the system log:

avahi-daemon[830]: Service group file /services/squid-deb-proxy.service vanished, removing services This happened after I had a "disk full" incident on the server it was running on. I couldn't find that error anywhere on Google so I figured that maybe the cache had been corrupted. So with squid-deb-proxy stopped I deleted everything from inside /var/cache/squid-deb-proxy and started the service again. It hasn't crashed since.