My game always crashes on the second day of every month

So, my game crashes every time I get to the second day of every month. I've tried the trick of getting to the first day of the month, save and change the date on the save file to day 3 and the game flows fine until the second day of the next month. Then the game crashes again. I have make this trick 4 times and the game still crashes. Does anyone know what kind of error is making the game crash?







I'm using the 1.9.1 version of the mod and I've played 87 years in the game