Element.SetParameterByName fail Dereferencing a non-pointer

Hi all,
I’m currently playing with some data that I would like managing from Dynamo. I have a DYN for adding some information by means of unique key identification for elements. DYN works fine for walls but not for ceilings and floors. Would you please help me?

Some blocks fail if the first element is empty or null. If it doesn’t solve the problem, you could share your graf so that we can test it. (You don’t need to share the hole graf, just where the problem occurs)

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Hi M.Perez,
Yes, you were right! thks so much!
(noted regarding hole graf)
Here pic of problem solved.

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I’m glad it worked!

If it solves your problem, don’t forget to mark it as solution