This exception was caught when deleting the text in the search row letter by letter. Deleting the last letter leads to errors in some cases. Internally in the GridDataCellElement GetSearchHighlightRanges() method, the Text.Length property is used. However, when the Text is null an exception will be raised. So far this exception was not isolated in a sample project. Still, it could be consider adding a null check for the Text property of the cell.