Tic Tac Toe - Abnormal mouse click behavior, sometimes resulting in crash

[Rafael09ED]

Currently mouse-clicks are incorrectly being registered. This sometimes results in a crash with the following error message:

Traceback (most recent call last):
  File ".\incorrect-tictactoe.py", line 157, in <module>
    clickBoard(board)
  File ".\incorrect-tictactoe.py", line 97, in clickBoard
    if ((grid[row][col] == "X") or (grid[row][col] == "O")):
IndexError: list index out of range

Normally where the user clicks is where the next X or O should be placed.