# element.intersectsElement Erro

**URL:** <https://forum.dynamobim.com/t/element-intersectselement-erro/114330>\
**Category:** Revit\
**Tags:** bimorph\
**Created:** [April 1, 2026, 3:49pm UTC](https://forum.dynamobim.com/t/element-intersectselement-erro/114330 "2026-04-01T15:49:55Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Watts.Ben](https://avatars.discourse-cdn.com/v4/letter/w/a9adbd/32.png) [@Watts.Ben](https://forum.dynamobim.com/u/Watts.Ben)\
**Post date:** [April 1, 2026, 3:49pm UTC](https://forum.dynamobim.com/t/element-intersectselement-erro/114330/1 "2026-04-01T15:49:55Z")

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Hi All,

I’m using the BIMorphs node element.intersectselement. But when i pass information into it i get a dereferencing a non-pointer error.

What could i be doing wrong ?

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**Author:** ![Robert\_Younger](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/robert_younger/32/205603_2.png) [@Robert\_Younger](https://forum.dynamobim.com/u/Robert_Younger)\
**Post date:** [April 1, 2026, 6:40pm UTC](https://forum.dynamobim.com/t/element-intersectselement-erro/114330/2 "2026-04-01T18:40:42Z")

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Please post a screenshot of the graph with the input/output previews of the local nodes shown. Hard to help without seeing the input/list structure output.

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<div class="post-metadata">

**Author:** ![Watts.Ben](https://avatars.discourse-cdn.com/v4/letter/w/a9adbd/32.png) [@Watts.Ben](https://forum.dynamobim.com/u/Watts.Ben)\
**Post date:** [April 2, 2026, 8:15am UTC](https://forum.dynamobim.com/t/element-intersectselement-erro/114330/3 "2026-04-02T08:15:22Z")

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Image of the nodes used.

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/1/d/1d48814534ca3e42c3fe680e948da03515740e7e.png)

What i’m trying to do is find all pipes, ducts and cable tray that passes through generic model families

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<div class="post-metadata">

**Author:** ![Robert\_Younger](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/robert_younger/32/205603_2.png) [@Robert\_Younger](https://forum.dynamobim.com/u/Robert_Younger)\
**Post date:** [April 2, 2026, 6:11pm UTC](https://forum.dynamobim.com/t/element-intersectselement-erro/114330/5 "2026-04-02T18:11:16Z")

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Interesting, I can pass empty lists into the bimorphs node just fine. A null input also produces a different warning entirely. I’d need to see an example where you’re actually getting the error to get a better understanding. It may also be a versioning difference.

Also, the List.IsEmpty check on your Generic Models should only be producing a single value due to the list level, and messes up the list filter. I’m assuming that’s a holdover from when you had additional categories in SetA.

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**Author:** ![john\_pierson](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/john_pierson/32/191977_2.png) [@john\_pierson](https://forum.dynamobim.com/u/john_pierson)\
**Post date:** [April 2, 2026, 7:51pm UTC](https://forum.dynamobim.com/t/element-intersectselement-erro/114330/6 "2026-04-02T19:51:10Z")

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Please provide an update with the following:

- Revit Version
- Dynamo Version
- BIMorph package version

Without that info, anyone helping you is not able to do so as effectively.