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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)