There's not much you can do to sort it, using other characters that's not in that map would be the best suggestion as mentioned above.
You'd need to wait until the server had a restart in order to fetch your stuck characters back again or play in the map again. If the map stops working for one and they get the message "Failed to connect to map server" message over and over, it will not really work for anyone that tries.
//////////////////////////////edit
Should be working now since there was a quick restart earlier.