Hello everyone,
So i've been doing the November challenges, and at this point, when I run the tests on my program it works quiet well, but the problem occures when i'm submitting my work, i get this Exception error:
```
Runtime Error Message:
AttributeError: 'NoneType' object has no attribute 'val'
l = [head.val]
Line 9 in insertionSortList (Solution.py)
ret = Solution().insertionSortList(param_1)
Line 54 in _driver (Solution.py)
_driver()
Line 65 in (Solution.py)

Can anyone please help me at this ? I'm quiet new on the plateform so maybe I'm still not well aware of everything's here.
Thanks.