Comment 3 for bug 1513851

As with https://bugs.launchpad.net/mahara/+bug/1474659, because this is a database change and it's not "high" priority, we won't backport the fix into the stable branches.

For existing Mahara sites (15.10 and earlier) that are affected by this problem, probably the easiest thing to do is to manually change the column using a MySQL "ALTER TABLE" query:

 ALTER TABLE activity_queue MODIFY COLUMN data LONGTEXT NOT NULL;