java.lang.NullPointerException
   at org.netbeans.modules.db.explorer.dlg.AddTableColumnDialog.updateState(AddTableColumnDialog.java:503)
   at org.netbeans.modules.db.explorer.dlg.AddTableColumnDialog.setDescriptor(AddTableColumnDialog.java:587)
   at org.netbeans.modules.db.explorer.dlg.AddTableColumnDialog.showDialogAndCreate(AddTableColumnDialog.java:647)
   at org.netbeans.modules.db.explorer.action.AddColumnAction$1.run(AddColumnAction.java:87)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2044)