java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at undefined.inwardRecord.actionPerformed(inwardRecord.java:314)
at javax.swing.JComboBox.fireActionEvent(Unknown Source)
at javax.swing.JComboBox.contentsChanged(Unknown Source)
at javax.swing.AbstractListModel.fireContentsChanged(Unknown Source)
at javax.swing.DefaultComboBoxModel.setSelectedItem(Unknown Source)
at javax.swing.DefaultComboBoxModel.addElement(Unknown Source)
at javax.swing.JComboBox.addItem(Unknown Source)
at undefined.inwardRecord.(inwardRecord.java:265)
at undefined.inwardRecord.main(inwardRecord.java:296)

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