Hey! Where exactly does the error show up? Does it always happen in the same spot?
Try deleting this file:
C:\Users\[YOUR_USERNAME]\AppData\Local\UnrealBoxing\Saved\SaveGames\CharacterCutomization.sav
or
C:\Users\[YOUR_USERNAME]\Documents\My Games\ProtoBoxing\Saved\CharacterCutomization.sav
Thanks for commenting — I hope that helps fix it! If not, let me know and I’ll keep digging into it.