Hey again! I've been looking through the code and retesting, but I'm having trouble replicating the crash. The first thing I'd recommend is to make sure you don't have any missing files, so you might want to try downloading the game again.
If that doesn't help, I've included a Dropbox link to a save file that is past the character select, so you can continue past that point while I search for any clues as to what might be causing the crash. You can download the save file and place it into the 'save' folder of the game directory to gain access to it in-game.
https://www.dropbox.com/s/o3x7brptm7d7iot/file1.rmmzsave?dl=0