I created a graphical quiz. The Tkinter window crashes when I press the multiple choice button on the subtraction quiz. It doesn’t crash on any other type of quiz. Sometimes it works when I click the multiple choice button, only to crash further into the quiz:

This code is to create a simple graphical quiz. The tkinter window always seems to crash when i press the multiple choice button on the substraction quiz. It doesnt crash on any other type of quiz. Sometimes it works when i click the multiple choice button only to crash further into the quiz.
Heres the code: