Okay figured out you have to have a checkout page even if you have a free course.
Beginning to think it is not LifterLMS causing this issue, but a permalink rewrite condition that is either stuck or being rewritten somewhere. I tried deactivating all plugins, then cycling the default permalinks, and the error persists. Before I gather any more information, is there a good way to back up all the lessons and quiz questions?
Apparently this is somehow related to a rewrite rule or the permalink structure. Weird that it happens on almost every page EXCEPT the “Courses” page. What makes it special when it comes to the rewrite rules?
