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

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This exception has no message.
java.lang.NullPointerException:
at org.eclipse.nebula.widgets.nattable.widget.NatCombo.getSelectionIndex(NatCombo.java:942)
at org.eclipse.nebula.widgets.nattable.edit.editor.ComboBoxCellEditor.getCanonicalValue(ComboBoxCellEditor.java:259)
at org.eclipse.nebula.widgets.nattable.edit.editor.AbstractCellEditor.commit(AbstractCellEditor.java:364)
at org.eclipse.nebula.widgets.nattable.edit.editor.AbstractCellEditor.commit(AbstractCellEditor.java:356)
at org.eclipse.nebula.widgets.nattable.NatTable.commitAndCloseActiveCellEditor(NatTable.java:1166)
at org.eclipse.nebula.widgets.nattable.ui.mode.ConfigurableModeEventHandler.mouseDown(ConfigurableModeEventHandler.java:41)
at org.eclipse.nebula.widgets.nattable.ui.mode.ModeSupport.mouseDown(ModeSupport.java:108)

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