# UE Engine Crash when selecting animation track details inside animation montage

**URL:** <https://forums.unrealengine.com/t/ue-engine-crash-when-selecting-animation-track-details-inside-animation-montage/2856025>\
**Category:** Issues and Bug Reporting (Unreal Engine)\
**Tags:** unreal-engine\
**Created:** [November 15, 2026, 1:55am UTC](https://forums.unrealengine.com/t/ue-engine-crash-when-selecting-animation-track-details-inside-animation-montage/2856025 "2026-11-15T01:55:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![robinjt](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@robinjt](https://forums.unrealengine.com/u/robinjt)\
**Post date:** [November 15, 2026, 1:55am UTC](https://forums.unrealengine.com/t/ue-engine-crash-when-selecting-animation-track-details-inside-animation-montage/2856025/1 "2026-11-15T01:55:29Z")

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### Summary

UE ENGINE CRASH when selecting an animation track inside an animation montage and trying to view its details panel

### What Type of Bug are you experiencing?

Editor

### Steps to Reproduce

- Created animation sequence
- Created animation montage from this sequence
- Opened animation montage, selected the animation track and the details panel → Engine crashes and work is lost ☹

### Expected Result

Not crashing!

### Observed Result

Crashed engine

Note Gemini apparent cause:  
“That crash stack points directly to an engine bug in Unreal Engine 5.8 where the Details panel triggers a null pointer access violation (0x6c0) inside OptimusCore and ComputeFramework when trying to introspect skeletal mesh deformer properties. Because your cube uses an Optimus/compute setup, clicking the Details panel instantly crashes the editor.”

### Affects Versions

5.8

### Platform(s)

Windows

### Upload an image

 ![2026-11-15 12_50_54-GravityCube - Unreal Editor.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/7/6/476f7eaa195ba1ac7285fe40f4720d7647e6904c.png)

### For crash reports, include your callstack

Unhandled Exception: EXCEPTION\_ACCESS\_VIOLATION reading address 0x00000000000006c0

UnrealEditor\_Engine  
UnrealEditor\_OptimusCore  
UnrealEditor\_ComputeFramework  
UnrealEditor\_OptimusCore  
UnrealEditor\_OptimusCore  
UnrealEditor\_Engine  
UnrealEditor\_Engine  
UnrealEditor\_UnrealEd  
UnrealEditor\_DetailCustomizations  
UnrealEditor\_DetailCustomizations  
UnrealEditor\_SlateCore  
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kernel32  
ntdll

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<div class="post-metadata">

**Author:** ![robinjt](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@robinjt](https://forums.unrealengine.com/u/robinjt)\
**Post date:** [November 15, 2026, 1:57am UTC](https://forums.unrealengine.com/t/ue-engine-crash-when-selecting-animation-track-details-inside-animation-montage/2856025/2 "2026-11-15T01:57:41Z")

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NOTE: I can prevent the crash by disabling “Allow Mesh Deformer” in Skeletal Mesh → LOD 0 settings. BUT I need to have this enabled for the chaos flesh physics in my game.

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/e/b/6ebd02cb494c60e51c776e961d82cab3047e7206.png)