Note: testing is easier when performing on a brand new site Prior to checking out the fix Add the following to site config.php : $CFG->creatornewroleid = 123; Log in as admin Create a new course (via Courses > Add a new course in site administration) You'll get an exception (expected) Manually navigate to the course Visit Participants Assign Admin User the Non-editing teacher role and save Execute the following SQL query in database terminal: SELECT * FROM moodle.m_role_assignments; Note there are two rows returned, one with roleid=123 and the other with roleid=4 After checking out fixed branch Run upgrade step when prompted Re-execute the previous SQL query Confirm the row with roleid=123 has been deleted Confirm the row with roleid=4 is still present Create a new course (via Courses > Add a new course in site administration) Confirm the course is created without exceptions Remove the following from site config.php : $CFG->creatornewroleid = 123; Create a new course (via Courses > Add a new course in site administration) Navigate to course participants Confirm Admin User was enrolled with role Teacher