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java.lang.NullPointerException: 	at undefined.Roulette.verwerkButton(Roulette.java:58)	at undefined.Roulette.action(Roulette.java:51)	at java.awt.Component.handleEvent(Component.java:5334)	at java.awt.Component.postEvent(Component.java:3878)	at java.awt.Component.postEvent(Component.java:3888)	at java.awt.Component.postEvent(Component.java:3888)	at java.awt.Component.dispatchEventImpl(Component.java:3614)	at java.awt.Component.dispatchEvent(Component.java:3439)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)