Bug with !vote

Hi,

I don't know if you already know this bug, but when a player type "!vote" (without quotes), MAM crash

Here the error :
"6:34 [30.04.10 00:41:48] Notice: Player 'A|IRIS| ToTo' executed command: 'vote', PID: 0, GUID: xxxxx
6:34 [30.04.10 00:41:48] !! Error: ConfigVar [voting]allowsetnextmap NOT set and can't use a default value"

And MAM restart 0_0