[Plus EMU] Critical Error Logged.

Hello,

I've gotten this critical error 2 times which it's the first time I've seen it.

Code:

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Error during removing user from room:System.NullReferenceException: Object reference not set to an instance of an object.
  at Silverwave.HabboHotel.Rooms.Games.TeamManager.OnUserLeave(RoomUser user) in c:\Users\Administrator\Desktop\Emulator [L]\Plus Emulator\HabboHotel\Rooms\Games\Teams.cs:line 174
  at Silverwave.HabboHotel.Rooms.RoomUserManager.RemoveUserFromRoom(GameClient Session, Boolean NotifyClient, Boolean NotifyKick) in c:\Users\Administrator\Desktop\Emulator [L]\Plus Emulator\HabboHotel\Rooms\RoomUserManager.cs:line 567

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Can anyone please tell me what's going on it and what's the fix for it.
Thanks.