Null is a state controller used by the M.U.G.E.N engine. Unlike other state controllers, the Null state controller has no required parameters, and accepts parameters used by all other state controllers. The intended purpose of the Null controller is to disable other state controllers by changing the controller's type to "Null". Although the Null controller does not do anything like other state controllers do, the triggers are still evaluated by the M.U.G.E.N engine, which can lead to other uses.