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java.lang.NullPointerException: 	at javax.swing.JComboBox$DefaultKeySelectionManager.selectionForKey(JComboBox.java:1207)	at javax.swing.JComboBox.selectWithKeyChar(JComboBox.java:1003)	at javax.swing.plaf.basic.BasicComboBoxUI$KeyHandler.keyPressed(BasicComboBoxUI.java:425)	at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:204)	at java.awt.Component.processKeyEvent(Component.java:3761)	at javax.swing.JComponent.processKeyEvent(JComponent.java:2073)	at java.awt.Component.processEvent(Component.java:3637)	at java.awt.Container.processEvent(Container.java:1202)	at java.awt.Component.dispatchEventImpl(Component.java:2678)	at java.awt.Container.dispatchEventImpl(Container.java:1251)	at java.awt.Component.dispatchEvent(Component.java:2581)	at java.awt.LightweightDispatcher.processKeyEvent(Container.java:2200)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2180)	at java.awt.Container.dispatchEventImpl(Container.java:1238)	at java.awt.Window.dispatchEventImpl(Window.java:964)	at java.awt.Component.dispatchEvent(Component.java:2581)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:434)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:141)	at java.awt.Dialog.show(Dialog.java:394)