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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicComboBoxUI$ListDataHandler.contentsChanged(Unknown Source)	at javax.swing.plaf.basic.BasicComboBoxUI$ListDataHandler.intervalAdded(Unknown Source)	at javax.swing.AbstractListModel.fireIntervalAdded(Unknown Source)	at javax.swing.DefaultComboBoxModel.addElement(Unknown Source)	at javax.swing.JComboBox.addItem(Unknown Source)	at sync.client.contactmgmt.activity.CaseGeneral.handleResponse(CaseGeneral.java:1382)	at sync.client.gateway.ServerProxy.handleResponse(ServerProxy.java:96)	at sync.client.gateway.UniversalGateway$1.run(UniversalGateway.java:142)	at java.awt.event.InvocationEvent.dispatch(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)