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java.lang.NullPointerException at Roulette.verwerkButton(Roulette.java:58) at 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)