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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