PlusEmu error in RoomManager.OnCycle Exception --> Not inclusive:

[Brad]

hey people been getting this error

The threaderror:

Error in thread RoomManager.OnCycle Exception --> Not inclusive:
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
  at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
  at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
  at System.Collections.Generic.List`1.Enumerator.MoveNext()
  at Silverwave.HabboHotel.Rooms.RoomManager.UnloadRoom(Room Room) in c:\Users\brad\Desktop\emu\Emulator\HabboHotel\Rooms\RoomManager.cs:line 658
  at Silverwave.HabboHotel.Rooms.RoomManager.RemoveTask() in c:\Users\brad\Desktop\emu\Emulator\HabboHotel\Rooms\RoomManager.cs:line 543
  at Silverwave.HabboHotel.Rooms.RoomManager.OnCycle() in c:\Users\brad\Desktop\emu\Emulator\HabboHotel\Rooms\RoomManager.cs:line 303

Don't know if I should just null it?