Prerequisite: A course with a forum activity 2 users(U1 & U2) enrolled into the course A discussion(D1) within the forum - with replies by all users involved A discussion(D2) within the forum created via the split functionality(of D1) in a way that the 2 discussions have different authors for their first posts ( Do this before the patch is applied ) DB access to confirm. Instructions: Case 1 - Upgrade steps - fix existing Access to DB and execute the following SQL query:  SELECT * FROM mdl_forum_discussions AS d INNER JOIN mdl_forum_posts AS p ON d.firstpost = p.id WHERE d.userid <> p.userid Confirm the previous query returns one row. Apply the patch. Run through the upgrade steps. Access to DB and execute the following SQL query:  SELECT * FROM mdl_forum_discussions AS d INNER JOIN mdl_forum_posts AS p ON d.firstpost = p.id WHERE d.userid <> p.userid Confirm the previous query now returns 0 rows. Case 2 - Split functionality - new splits As user U1, post a reply in D1. As an admin, go to discussion D1. Split U1's post from #1 into a new discussion(D3). Access to DB and execute the following SQL query:  SELECT * FROM mdl_forum_discussions AS d INNER JOIN mdl_forum_posts AS p ON d.firstpost = p.id WHERE d.userid <> p.userid Confirm the previous query still returns 0 rows.