How to make new lists of walls that intersect from a list of walls?

Good morning,

I’m attempting to create lists of walls that intersect from a list of walls. I tried with this python code, but for some reason it seems to crash my program:
image

I am attempting to do the same with nodes but am having trouble. Can someone help me with this problem?

Thank you!

I believe I solved it. Will update if I find an issue.

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