Fatal Errors From an AnimGraph

Can anyone assist with this error stack? Seems to happen randomly while playing in editor, it is a fatal error with this log.

I think it has to do with the animgraph, but I was hoping for any help.

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 611] Array index out of bounds: 523 from an array of size 101

UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:425]
UE4Editor_AnimGraphRuntime!FCSPose::CalculateComponentSpaceTransform() [d:\build++ue4\sync\engine\source\runtime\engine\public\bonepose.h:594]
UE4Editor_AnimGraphRuntime!FCSPose::GetComponentSpaceTransform() [d:\build++ue4\sync\engine\source\runtime\engine\public\bonepose.h:568]
UE4Editor_AnimGraphRuntime!FAnimNode_ModifyBone::EvaluateSkeletalControl_AnyThread() [d:\build++ue4\sync\engine\source\runtime\animgraphruntime\private\bonecontrollers\animnode_modifybone.cpp:48]
UE4Editor_AnimGraphRuntime!FAnimNode_SkeletalControlBase::EvaluateComponentSpace_AnyThread() [d:\build++ue4\sync\engine\source\runtime\animgraphruntime\private\bonecontrollers\animnode_skeletalcontrolbase.cpp:155]
UE4Editor_Engine!FComponentSpacePoseLink::EvaluateComponentSpace() [d:\build++ue4\sync\engine\source\runtime\engine\private\animation\animnodebase.cpp:352]
UE4Editor_AnimGraphRuntime!FAnimNode_SkeletalControlBase::EvaluateComponentSpace_AnyThread() [d:\build++ue4\sync\engine\source\runtime\animgraphruntime\private\bonecontrollers\animnode_skeletalcontrolbase.cpp:142]
UE4Editor_Engine!FComponentSpacePoseLink::EvaluateComponentSpace() [d:\build++ue4\sync\engine\source\runtime\engine\private\animation\animnodebase.cpp:352]
UE4Editor_AnimGraphRuntime!FAnimNode_SkeletalControlBase::EvaluateComponentSpace_AnyThread() [d:\build++ue4\sync\engine\source\runtime\animgraphruntime\private\bonecontrollers\animnode_skeletalcontrolbase.cpp:142]
UE4Editor_Engine!FComponentSpacePoseLink::EvaluateComponentSpace() [d:\build++ue4\sync\engine\source\runtime\engine\private\animation\animnodebase.cpp:352]
UE4Editor_AnimGraphRuntime!FAnimNode_SkeletalControlBase::EvaluateComponentSpace_AnyThread() [d:\build++ue4\sync\engine\source\runtime\animgraphruntime\private\bonecontrollers\animnode_skeletalcontrolbase.cpp:142]
UE4Editor_Engine!FComponentSpacePoseLink::EvaluateComponentSpace()

Hello,

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Thanks