NullpointerException

Im Singleplayer modus stürzt das Spiel irgendwann einfach ab auf meinem PC.
java.lang.NullPointerException
    at de.ggj14.wap.common.datamodel.GameState.update(GameState.java:72)
    at de.ggj14.wap.states.Singleplayer.update(Singleplayer.java:142)
    at org.newdawn.slick.state.StateBasedGame.update(StateBasedGame.java:266)
    at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:663)
    at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
    at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
    at de.ggj14.wap.WapGame.main(WapGame.java:75)
Mon May 05 18:19:57 CEST 2014 ERROR:Game.update() failure - check the game code.
org.newdawn.slick.SlickException: Game.update() failure - check the game code.
    at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:669)
    at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
    at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
    at de.ggj14.wap.WapGame.main(WapGame.java:75)
01:29 DEBUG: Spiel beendet
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