# Crash after selecting a "Two Bone IK" node in Animation Blueprint

**URL:** <https://forums.unrealengine.com/t/crash-after-selecting-a-two-bone-ik-node-in-animation-blueprint/309009>\
**Category:** Character & Animation\
**Tags:** unreal-engine, crash, bug-report, editor, UE4, question, Blueprint\
**Created:** [March 3, 2015, 9:46pm UTC](https://forums.unrealengine.com/t/crash-after-selecting-a-two-bone-ik-node-in-animation-blueprint/309009 "2015-03-03T21:46:51Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![anonymous\_user\_0836aa97](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_0836aa97](https://forums.unrealengine.com/u/anonymous_user_0836aa97)\
**Post date:** [March 3, 2015, 9:46pm UTC](https://forums.unrealengine.com/t/crash-after-selecting-a-two-bone-ik-node-in-animation-blueprint/309009/1 "2015-03-03T21:46:51Z")

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editor freezes when clicking two bone IK nodes in 4.7.1 on anim blueprints, have to use windows 8.1 task manager to end task

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**Author:** ![anonymous\_user\_0836aa97](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_0836aa97](https://forums.unrealengine.com/u/anonymous_user_0836aa97)\
**Post date:** [March 5, 2015, 8:25pm UTC](https://forums.unrealengine.com/t/crash-after-selecting-a-two-bone-ik-node-in-animation-blueprint/309009/2 "2015-03-05T20:25:27Z")

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still in 4.7.2

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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:** [March 5, 2015, 9:07pm UTC](https://forums.unrealengine.com/t/crash-after-selecting-a-two-bone-ik-node-in-animation-blueprint/309009/3 "2015-03-05T21:07:14Z")

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Hey dimpolz,

Good timing! I was just entering the bug for this as UE-11369 (bug number here for tracking purposes only). I also reproduced it in 4.7.2. Thank you for reporting this!

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EDIT: Just to add, I let it sit after it froze and it ended up crashing out and giving me a callstack.

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<div class="post-metadata">

**Author:** ![anonymous\_user\_0836aa97](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_0836aa97](https://forums.unrealengine.com/u/anonymous_user_0836aa97)\
**Post date:** [March 6, 2015, 7:24am UTC](https://forums.unrealengine.com/t/crash-after-selecting-a-two-bone-ik-node-in-animation-blueprint/309009/4 "2015-03-06T07:24:08Z")

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thanks for updating, i never let it crash though. even if i saw the stack… probably won’t be able to debug myself… the source is quite daunting… maybe you guys could have a source walkthrough/debugging quick start guide.

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<div class="post-metadata">

**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:** [March 8, 2015, 10:14pm UTC](https://forums.unrealengine.com/t/crash-after-selecting-a-two-bone-ik-node-in-animation-blueprint/309009/5 "2015-03-08T22:14:29Z")

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Can you enter a request for a source debugging guide? We generally prefer to separate requests like that and one of our C++ guys would be better suited to helping there.