So, according to this Pig of a crash - "Pure virtual function being called while application was running" - #51 by Max.Chen , there was a bug regarding [“Pure virtual function being called while application was running”].
There, a staff member says that it’s been fixed for 5.6, and that there’s a workaround for previous versions. I’m using a pre-fix version of the engine, have a custom GameInstance, and the GitHub link to the workaround is dead.
Could someone point me to that workaround?