Null (State Controller)

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.

Null overflow glitch
A peculiar glitch exists involving the use of multiple Null controllers in earlier versions of M.U.G.E.N, which allows for player 2's states to be overwritten by player 1 without the need for hitcontact. Extremely cheap characters often abuse this glitch by causing an automatic KO on player 2.