On night 11 if you're doing Morgan's Lust route and only doing lust you can get a CTD (crash to desktop) or an error that could make you need to restart the game if you chose cowgirl when you go to sleep. At least with the steam version on windows. Not sure what I've done to get it but uh, it's there. Also the error in question.
Doubt the dev will do anything about it seeing how they moved on to a new project and it's probably a very specific set of steps to get the error. So yeah. Be warned it might happen if you do that. So just chose a different option.
Edit: Never mind. The error is thrown when ever you chose cowgirl when you sleep. So don't chose that.
Also if the dev reads this because I know you lurk here. Good game. It's a shame I couldn't support you beyond buying the game. It's interesting if short. Worth the price I paid. Not sure if everyone would buy it though. Due to the concept and all. I wish you luck on your future project.