# Unreal Engine Crashing When Flattening

**URL:** <https://forums.unrealengine.com/t/unreal-engine-crashing-when-flattening/1841518>\
**Category:** Programming & Scripting\
**Tags:** unreal-engine\
**Created:** [May 5, 2024, 4:45pm UTC](https://forums.unrealengine.com/t/unreal-engine-crashing-when-flattening/1841518 "2024-05-05T16:45:55Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![motionlenn](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@motionlenn](https://forums.unrealengine.com/u/motionlenn)\
**Post date:** [May 6, 2024, 3:04pm UTC](https://forums.unrealengine.com/t/unreal-engine-crashing-when-flattening/1841518/4 "2024-05-06T15:04:33Z")

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I have the same issue. Unreal 5.4.1 with Macbook M3 Max.  
I found that some tools (like flatten and smooth) have a setting called “Combined layers operation”. Disabling this fixed the issue and is not resulting in an immediate crash.  
Same computer with Unreal Version 5.3 is not causing the issue.  
It is most likely a bug in version 5.4.1

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