I see the log of your crash on the server, and it is very, very odd. Never seen anything like it, and I can't explain this one, but it has something to do with an oddity in the command processing system while trying to shut down the game at the same time. No idea on this one--will need more info to address it but we've never seen this before...
Out of curiosity, was it the "Valguris-171221-003221-0-12654.txt" run?