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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)