Ticket #7900: 7900.patch

_source/plugins/table/dialogs/table.js

@@ -334 +334 @@
                                                                                                 for ( var row = 0 ; row < selectedTable.$.rows.length ; row++ )
                                                                                                 {
                                                                                                         // If just one cell isn't a TH then it isn't a header column
-                                                                                                        if ( selectedTable.$.rows[row].cells[0].nodeName.toLowerCase() != 'th' )
+                                                                                                        var headCell = selectedTable.$.rows[row].cells[0];
+                                                                                                        if ( headCell && headCell.nodeName.toLowerCase() != 'th' )
                                                                                                         {
                                                                                                                 dialog.hasColumnHeaders = false;
                                                                                                                 break;