End of game is not handled

[StevenInfinity]

After 1 player wins the loop is still running and finally ends in error. The following errors was obtained

Traceback (most recent call last):
File "C:/Users/chainreaction.py", line 243, in
gameLoop()
File "C:/Users/chainreaction.py", line 220, in gameLoop
addAtom(i, j, players[currentPlayer])
File "C:/Users/chainreaction.py", line 137, in addAtom
overFlow(grid[i][j], color)
File "C:/Users/chainreaction.py", line 147, in overFlow
overFlow(cell.neighbors[m], color)
File "C:/Users/chainreaction.py", line 147, in overFlow
overFlow(cell.neighbors[m], color)
File "C:/Users/chainreaction.py", line 147, in overFlow
overFlow(cell.neighbors[m], color)
[Previous line repeated 1018 more times]
File "C:/Users/chainreaction.py", line 141, in overFlow
showPresentGrid()
File "C:/Users/chainreaction.py", line 104, in showPresentGrid
for i in range(cols):
RecursionError: maximum recursion depth exceeded in comparison