Dereferencing a non-pointer from List.FilterByBoolMask

[torresblancas]

Hello, Dynamo beginner here!
I am trying to filter out the walls that are more than 12 feet by using List.FilterByBoolMask but it gives me an error “Deferencing a non-pointer.”. I thought this would work since both inputs (list and mask) have the same length(1194) and product of > is a list of booleans. Help me solve this! Thank youu

[pyXam]

in your > Node, are there any nulls or empty lists?

[torresblancas]

I found out that only index 981 is a null. Do you think there’s a way to bypass this?

[pyXam]

here is a simple way

[torresblancas]

Thank you so much! I was able to solve it by doing this:
I couldn’t figure out how to filter the null out without using an extra condition