Soft lock after opponent desync/disconnect

Started a casual game as Arg vs Geiger. Match desynced, and then threw me into a single game as Setsuki vs Geiger. Completed the match for kicks, but after the win animation no menu was presented and it was not possible to pause the game.

Crash log: https://pastebin.com/AXgXh1nU

EDIT: Pastebin dropped the logfile, good thing I still had the tab open! https://controlc.com/969020e5