Oh god, I just realised what the crash is about. I will contact the organisers of the Jam.
If someone wants a more indepth look into why it happens then here is the explanation. Thank you Raisoshi for giving the error as the bug is already fixed in my internal version that I thought was uploaded... oops.
Anyways, the bug happens due to the tool tips, and that I changed how the autoclicking works. If you quickly buy the autoclicker, without staying on the button for too long, it should work. Why? Well, the tooltips are trying to look for a variable that doesn't exist since it got deleted due to how I change the internal workings of the automatic stuff in the game.
I will contact the Jam organisers to ask if I can upload a new version with this bug patched up.
Sorry to everyone that had played and wasted their sanity on downloading a random itch file.
Posted this comment on the Jam page but also decided to put it here. Thanks!