I wanted to try and make my own map, but memory access violation popped up. I tried some fixes I found on the internet, and none of them worked. Can someone tell me how to fix this?

Did you mod the game?

I use the bugfix, but otherwise, not at all.

I do get this, but I always save commonly, just to be safe, so like after every 5 rooms I place, save. you know what they say, "save frequently"