I just had the same error, forcing error did not work and I couldn't remember how to generate an error log (going to go write that down now
) Didn't get a chance to try the lot debugger.
However, I did notice that the error occured at a portal, and that just prior the penguin had tried to enter through the portal at the other end of the lot. It was prevented from doing so by a stray that was attemping to leave through the same portal the penguin was trying to enter. They both sat there and "glitched" for a minute before disappearing. When the penguin reappeared at the other portal he was still having the same "glitchy" type of behavior, as in he looked as though he were stuck on a treadmill.
ETA I do have some object errors in my log for today, would they be of any use to anyone?