# \[4.8.0-preview-3\] Animation Retargeting crash when changing bone mapping

**URL:** <https://forums.unrealengine.com/t/4-8-0-preview-3-animation-retargeting-crash-when-changing-bone-mapping/320208>\
**Category:** Character & Animation\
**Tags:** unreal-engine, crash, question\
**Created:** [May 30, 2015, 6:07am UTC](https://forums.unrealengine.com/t/4-8-0-preview-3-animation-retargeting-crash-when-changing-bone-mapping/320208 "2015-05-30T06:07:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![staticvoidlol](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@staticvoidlol](https://forums.unrealengine.com/u/staticvoidlol)\
**Post date:** [May 30, 2015, 6:07am UTC](https://forums.unrealengine.com/t/4-8-0-preview-3-animation-retargeting-crash-when-changing-bone-mapping/320208/1 "2015-05-30T06:07:50Z")

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Steps to reproduce:

1. Follow official documentation tutorial: [link text](https://docs.unrealengine.com/latest/INT/Engine/Animation/RetargetingDifferentSkeletons/index.html)

2. At step 6, e.g. after mapping the Pelvis bone to Hip bone, click the selector again and select a different bone and it will crash on

The crash is due to the BoneInfo param being null.

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**Author:** ![anonymous\_user\_280dd372](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_280dd372](https://forums.unrealengine.com/u/anonymous_user_280dd372)\
**Post date:** [June 9, 2015, 6:00pm UTC](https://forums.unrealengine.com/t/4-8-0-preview-3-animation-retargeting-crash-when-changing-bone-mapping/320208/2 "2015-06-09T18:00:21Z")

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Hey staticvoidlol,

This was [already reported](https://answers.unrealengine.com/questions/231372/retarget-manager-crash-when-changing-bones.html) (UE-16172) and we’ve got a fix in 4.8 Preview 4. Thanks for calling it out though!!

-.

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**Author:** ![staticvoidlol](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@staticvoidlol](https://forums.unrealengine.com/u/staticvoidlol)\
**Post date:** [June 23, 2015, 6:45am UTC](https://forums.unrealengine.com/t/4-8-0-preview-3-animation-retargeting-crash-when-changing-bone-mapping/320208/3 "2015-06-23T06:45:59Z")

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Great - thanks !