Error occurring on Friend entering Multiplayer game, Starting mission fails, and failure to exit/end session properly

Hmm, maybe try deleting that quest before your friend gets on? I know i had a minor error related to a quest that was help (not shared) by a friend before the update in a long game. The error didn't pop up until after a 6/7 hour session after I logged out and never got it again, maybe something went wonky after the update. The main complaint I see in the log is the quest POI lock, so in theory deleting that quest and avoiding the POI (quest-wise) for a few in-game hours may help

I have a hunch that it may be something with POI updates at quest locations, maybe tied to an active quest and it gets updated? Not sure, I will check that area out; if you have extra information (think the chain of events leading to getting the issue, try to recall everything you can) please do update.