Unreal Engine 5.4.2 Crashes all th etime with Assertion Failed Pose Error

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Assertion failed: Pose.IsValidIndex(BoneIndex) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Public\BonePose.h] [Line: 569]

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All I have been doing is working on sequencer, created one sequence. Have three characters, audio, retargetted poses from Mixamo. Everything was going well until I wanted to add face animation from iphone. Used converter, saved the file. Applied to my metahuman, next thing you know, the engine crashes. Now Unreal Engine crashes EVERY TIME I open that sequence file. All other files work well. Long story short, I don’t want to restart work I spent 5 hours doing just because it keeps crashing for no reason. Please help me.

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I don’t have an answer yet but to make you feel a tiny bit better I’ve just run into the same problem but I’m using my own character and I have just added some virtual bones.

Anyway i’ll let you know when I figure it out.

P.S. Update to 5.4.2 realeased…trying that…

1 Like
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Maaaan, at least I am not alone. Hope someone finds the fix. I am going to try to reinstall 5.4.2 but maaan, was dreading. It has crashed so much I just wonder how big budget studios work with Unreal Engine at times.

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I don’t know if this may help you since you are in the sequencer, but since I found a work-around for my case, I thought I post it.

In my case, I got this crash when exiting the game after I’ve added a “look-at” in my animation graph, and through it modified the head and neck bone.

My solution was to cache the pose instead of having it run on the “main execution” line.

Why? I dunno :S Afaik the crash is because a invalid boneindex is provided. In my case, I guess something got screwed up upon exiting the game, but caching it help.

Hopefully this may help put you on the right track to solve your problem!

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Hi Niklas, I DO have an animation blueprint…maybe this may be causing a problem? But the weird thing is I added this animation blueprint through tutorials I watched through Unreal Fellowship…long story short, it splits upperbody animation from lowerbody animation…Will play around with it. You may have pointed me in the right direction. Thank you!

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Tried that right away. I was so desperate but nah. No luck. I find if I open another sequence and play around in it, when I come back, I am able to work on that scene that was giving problems…until after a while it doesn’t like something and crashes me out again with the same error. Its SO weird.