java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException: 	at sun.java2d.SunGraphics2D.revalidateAll(SunGraphics2D.java:2086)	at sun.java2d.SunGraphics2D.getCompClip(SunGraphics2D.java:439)	at sun.java2d.SunGraphics2D.invalidateClip(SunGraphics2D.java:1640)	at sun.java2d.SunGraphics2D.setClip(SunGraphics2D.java:1746)	at sun.java2d.SunGraphics2D.setClip(SunGraphics2D.java:1737)	at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4804)	at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4748)	at javax.swing.JComponent._paintImmediately(JComponent.java:4692)	at javax.swing.JComponent.paintImmediately(JComponent.java:4495)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:449)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)