ofc i googled error before leaving comment and ofc i tried to debug it.
The None variable is placed somewhere in checking function.
I just dont have variables with names that are in the error output.

My code is ok for most of the cases, but in some cases it gives output like this:
Traceback (most recent call last):
File "/workspace/default/.venv/lib/python3.10/site-packages/codewars_test/test_framework.py", line 112, in wrapper
func()
File "/workspace/default/tests.py", line 30, in _
test.assert_equals(is_cycle(find_cycle(a,b),a,b), exp,msg)
File "/workspace/default/tests.py", line 10, in is_cycle
return path[0] == path[-1] and len(set(path)) == a*b and all((abs(pos_2[0]-pos_1[0]),abs(pos_2[1]-pos_1[1])) in moves and
TypeError: 'NoneType' object is not subscriptable
Isn`t it a mistake in the checking?

Cool!