# Engine crashing anytime i move or delete a BSP brush **URL:** \ **Category:** World Creation\ **Tags:** Destroy-Actor, unreal-engine, UE5-0, Collision, question\ **Created:** [May 17, 2022, 4:22pm UTC](https://forums.unrealengine.com/t/engine-crashing-anytime-i-move-or-delete-a-bsp-brush/559487 "2022-05-17T16:22:54Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![vslash9](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@vslash9](https://forums.unrealengine.com/u/vslash9)\ **Post date:** [May 17, 2022, 4:22pm UTC](https://forums.unrealengine.com/t/engine-crashing-anytime-i-move-or-delete-a-bsp-brush/559487/1 "2022-05-17T16:22:55Z")
Title pretty much says it all. Assertion failed: Actor-\>Brush-\>RootOutside [File:D:\build++UE5\Sync\Engine\Source\Developer\BSPUtils\Private\BSPOps.cpp] [Line: 527] UnrealEditor\_BSPUtils UnrealEditor\_UnrealEd UnrealEditor\_UnrealEd UnrealEditor\_UnrealEd UnrealEditor\_UnrealEd UnrealEditor\_Engine UnrealEditor\_LevelEditor UnrealEditor\_Engine UnrealEditor\_Engine UnrealEditor\_UnrealEd UnrealEditor\_UnrealEd UnrealEditor\_UnrealEd UnrealEditor\_UnrealEd UnrealEditor\_UnrealEd UnrealEditor\_LevelEditor UnrealEditor\_LevelEditor UnrealEditor\_Slate UnrealEditor\_Slate UnrealEditor\_UnrealEd UnrealEditor\_LevelEditor UnrealEditor\_Slate UnrealEditor\_Slate UnrealEditor\_Slate UnrealEditor\_ApplicationCore UnrealEditor\_ApplicationCore UnrealEditor\_ApplicationCore UnrealEditor\_ApplicationCore user32 user32 InkObj atlthunk user32 user32 UnrealEditor\_ApplicationCore UnrealEditor UnrealEditor UnrealEditor UnrealEditor UnrealEditor UnrealEditor kernel32 ntdll ---
**Author:** ![Astrotronic](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/astrotronic/32/1194566_2.png) [@Astrotronic](https://forums.unrealengine.com/u/Astrotronic)\ **Post date:** [May 17, 2022, 6:18pm UTC](https://forums.unrealengine.com/t/engine-crashing-anytime-i-move-or-delete-a-bsp-brush/559487/2 "2022-05-17T18:18:22Z")
Hi vslash, I just poked around with some BSP brushes and I’m not able to reproduce this in my 5.0.1 project. If you want to post some steps to reproduce this from a new project I can give it a shot. Also, with solid repro steps, a [bug submission](https://epicsupport.force.com/unrealengine/s/?language=en_US) could be a good step forward. I love BSP, and although I expect it to be maintained/supported for a good while longer, I think it’s important to mention the new [Modeling Tools](https://docs.unrealengine.com/5.0/en-US/modeling-mode-overview/) as _the_ alternative to BSP ---
**Author:** ![vslash9](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@vslash9](https://forums.unrealengine.com/u/vslash9)\ **Post date:** [May 18, 2022, 2:09am UTC](https://forums.unrealengine.com/t/engine-crashing-anytime-i-move-or-delete-a-bsp-brush/559487/3 "2022-05-18T02:09:05Z")
I cant seem to reproduce it so far. Its basically just 1 box with another box subtracting from it to create an empty middle. I cant seem to move or delete either of them. Ive had them sitting in my scene for a week so not sure when this error started happening ;/ I feel like Assertion failed: Actor-\>Brush-\>RootOutside probably gives clues but not sure what exactly it means ---
**Author:** ![Unbansheee](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Unbansheee](https://forums.unrealengine.com/u/Unbansheee)\ **Post date:** [May 23, 2022, 10:32am UTC](https://forums.unrealengine.com/t/engine-crashing-anytime-i-move-or-delete-a-bsp-brush/559487/4 "2022-05-23T10:32:30Z")
I’ve been having the exact same crash. For me it happens whenever I resize a BSP, place any mesh from the modelling tools or even doing Ctrl Z on a postprocess volume. Still haven’t found a fix yet. It all seems to work completely fine on another project I have locally, so I do wonder what has gone wrong. Another thing to note is that my teammates suffer the same crash too. ---
**Author:** ![vslash9](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@vslash9](https://forums.unrealengine.com/u/vslash9)\ **Post date:** [May 25, 2022, 10:54pm UTC](https://forums.unrealengine.com/t/engine-crashing-anytime-i-move-or-delete-a-bsp-brush/559487/5 "2022-05-25T22:54:47Z")
Hey sorry just saw this. For me the problem was that I was using the world partition system. I don’t know about the technical details at all but what worked for me was unloading all cells in the world partition. Then for some reason I could delete and move the bugged assets and reload the cells back ---
**Author:** ![Unbansheee](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Unbansheee](https://forums.unrealengine.com/u/Unbansheee)\ **Post date:** [May 26, 2022, 10:49am UTC](https://forums.unrealengine.com/t/engine-crashing-anytime-i-move-or-delete-a-bsp-brush/559487/6 "2022-05-26T10:49:37Z")
Cheers for that, it appears to have fixed it for me. Strangely, I still crash if I attempt it in a non World Partition level. But at least I’m still able to utilise the tools under the right circumstances