Swift emu critical error

Hi,


When someone enter a room the this error is coming up:

PHP Code:

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TokenID: 0System.NullReferenceException: Object reference not set to an instance of an object.
   at Butterfly.HabboHotel.Rooms.RoomUser.Serialize(ServerMessage Message, Boolean gotPublicRoom) in C:\Users\Administrator\Desktop\leaf\emu\Revision 5 - Alpha 3\Butterfly\HabboHotel\Rooms\RoomUser.cs:line 574
   at Butterfly.HabboHotel.Rooms.RoomUserManager.OnUserAdd(Object sender, EventArgs args) in C:\Users\Administrator\Desktop\leaf\emu\Revision 5 - Alpha 3\Butterfly\HabboHotel\Rooms\RoomUserManager.cs:line 826 


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Does anyone know how to fix this? I think it's something with the rooms, public rooms or the room items.