1.) create an database activity enry and delete the creator user.

2.) Try to exprt the entries with user data to csv-File

This Error happen:

Error: mod_data\local\exporter\entries_exporter::add_to_current_row(): Argument #1 ($cellcontent) must be of type string, null given, called in [dirroot]/mod/data/classes/local/exporter/utils.php on line 127