ID:1788616
 
(See the best response by Lummox JR.)

Problem description:

Was hosting my game and my dream deamon crashed. I looked in Log Session and i got runtime error: BYOND Error: bad mob. Since I never had the error like that, I would like to know what it is and what can couse it ? After restarting server everything seems to be ok.

Best response
"Bad mob" comes from trying to access a var of a mob reference that doesn't exist. The most likely cause for this is a bug in list handling in version 506, which has been fixed in newer 507 builds. I strongly advise switching to 507 if you haven't already.
Thanks for the replay. I sure will do it now :)