Game Crash When Accepting Invite

Just the other day, my friend and I played this game co-op for about 2.5 hours with no problem. The next day, for some reason, we can’t seem to connect – regardless of whether he hosts, or I host. The game immediately crashes, every time. I have read that creating a new save file is a fix for this problem, but we’ve made a decent amount of progress in the time we’ve played and I don’t want that going to waste. Is there a fix for this?

My specs:
Ryzen 7 3700X
32GB DDR4
GTX 1070

A post was merged into an existing topic: Crash to Desktop on Joining Co-op (PC)