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java.lang.NullPointerException at javax.swing.plaf.basic.BasicComboBoxUI$EditorFocusListener.focusLost( at java.awt.AWTEventMulticaster.focusLost( at java.awt.AWTEventMulticaster.focusLost( at java.awt.Component.processFocusEvent( at javax.swing.JComponent.processFocusEvent( at java.awt.Component.processEvent( at java.awt.Container.processEvent( at java.awt.Component.dispatchEventImpl( at java.awt.Container.dispatchEventImpl( at java.awt.Component.dispatchEvent( at java.awt.LightweightDispatcher.processFocusEvent( at java.awt.LightweightDispatcher.dispatchEvent( at java.awt.Container.dispatchEventImpl( at java.awt.Window.dispatchEventImpl( at java.awt.Component.dispatchEvent( at java.awt.EventQueue.dispatchEvent( at java.awt.EventDispatchThread.pumpOneEvent( at java.awt.EventDispatchThread.pumpEvents( at