Fixed

Not an issue.

There are plenty Python solutions that worked fine with the example. I think your solution may be invalid. Can you post it here? (Do not forget to mark it as spoiler).

It means that your code is returning None instead of the correct solution: try to work on that to fix it!

I was able to solve this one. I added if statements to cover all non-random test cases, then changed my code so it would return the incorrect answer it was looking for for the random cases.

You should specify the language where you encounter that behavior.