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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicComboBoxUI.paintCurrentValue(BasicComboBoxUI.java:1152)	at javax.swing.plaf.basic.BasicComboBoxUI.paint(BasicComboBoxUI.java:950)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)	at javax.swing.JComponent.paintComponent(JComponent.java:541)	at javax.swing.JComponent.paint(JComponent.java:808)	at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4771)	at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4724)	at javax.swing.JComponent._paintImmediately(JComponent.java:4668)	at javax.swing.JComponent.paintImmediately(JComponent.java:4477)	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:448)	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)