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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicComboBoxUI$EditorFocusListener.focusLost(BasicComboBoxUI.java:1398)	at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:171)	at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:170)	at java.awt.Component.processFocusEvent(Component.java:3644)	at javax.swing.JComponent.processFocusEvent(JComponent.java:2058)	at java.awt.Component.processEvent(Component.java:3537)	at java.awt.Container.processEvent(Container.java:1164)	at java.awt.Component.dispatchEventImpl(Component.java:2595)	at java.awt.Container.dispatchEventImpl(Container.java:1213)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.LightweightDispatcher.processFocusEvent(Container.java:2167)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2130)	at java.awt.Container.dispatchEventImpl(Container.java:1200)	at java.awt.Window.dispatchEventImpl(Window.java:912)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:319)	at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:103)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:84)