Hangman Game - IndexError: list index out of range - It's because of my for loop on line 89 but I don't know how to fix it

Question

Traceback (most recent call last): File "main.py", line 89, in update += guesses[i] IndexError: list index out of range

On line 89, only happens if you input a correct letter, I know it's because of the list not having a way to stop after a certain number but I don't know what to add to make that happen, I thought I knew but my mind is blank.

Code area that has error

update = ""
for i in range(len(word)):
  if Guess == word[i]:
    update += Guess
  else:
    update += guesses[i]
guesses = update

Full code: https://github.com/BUBBLEGUM846/BUBBLEGUM846/blob/main/Hangman