Ok, that narrows it down a bit. Just so we're clear, I know you said the file is from before the Let's Go Together skill was added, but did you use the skill at all during your playthrough? The section of the game_event script that the error is referencing is the section that deals with offscreen events, which may be related to the way I attempted to fix the collision issues with the Let's Go Together skill.
Also, if it helps, there's now a debug option in the Training Sim to fix issues with followers (it's the Sparky, my followers are causing problems) option. Selecting that option may help reduce the chances of the crash occurring!
ok after more testing and using the debug option for fallowers to reset them i still ended up crashing. This also my be something from my end do to the fact that another game i play SUPER FATTY RPG seems to be doing the same random crashing when i went to replay it the only known constant i know between these is any game that seems to force a resolution change on my screen now seems to randomly crash on me if you know anything or a case that sounds similar to my own pls do inform me of any possible factors that have caused these issues b4 or any fixes i could do for the issue.