# Box brush causing error in line trace

**URL:** <https://forums.unrealengine.com/t/box-brush-causing-error-in-line-trace/479480>\
**Category:** UI\
**Tags:** crosshair, linetrace, tags, unreal-engine, question\
**Created:** [February 26, 2021, 4:17pm UTC](https://forums.unrealengine.com/t/box-brush-causing-error-in-line-trace/479480 "2021-02-26T16:17:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mastaboeba](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Mastaboeba](https://forums.unrealengine.com/u/Mastaboeba)\
**Post date:** [February 26, 2021, 4:17pm UTC](https://forums.unrealengine.com/t/box-brush-causing-error-in-line-trace/479480/1 "2021-02-26T16:17:17Z")

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Hello again!

I am working on making a crosshair change when hovering over a interactable. Everything is working but i keep getting error message’s when hovering over a Box Brush, a wall for example.

This is the error i am getting (repeatedly) :  
Blueprint Runtime Error: “Accessed None trying to read property CallFunc\_BreakHitResult\_HitActor\_4”. Blueprint: BCrick Function: Execute Ubergraph BCrick Graph: EventGraph Node: Branch

Character BP:

 ![331020-linetraceerror.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/5/8/858aba5604b4a08cc93bcfd87ac52ff2a5a7d7d1.jpeg)

thanks!

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<div class="post-metadata">

**Author:** ![Marcis](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/marcis/32/1103070_2.png) [@Marcis](https://forums.unrealengine.com/u/Marcis)\
**Post date:** [February 26, 2021, 7:44pm UTC](https://forums.unrealengine.com/t/box-brush-causing-error-in-line-trace/479480/2 "2021-02-26T19:44:48Z")

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Afaik this is expected with BSP’s. Check if the actor is valid before you query the tag.