The config setting enrol_localcoursefield is not used by enrol/ldap except to be unset at enrol/ldap/enrol.php, lines 390-393, version 1.20. Since enrol/database uses still uses this nomenclature, saving the enrol/ldap config blanks this required field for enrol/database and breaks database enrollment. I think these lines should be removed: 390 if (!isset ($config->enrol_localcoursefield)) { 391 $config->enrol_localcoursefield = ''; 392 } 393 set_config('enrol_localcoursefield', $config->enrol_localcoursefield);