Unreal Engine Issues and Bug Tracker (UE-56395)

Description

When a post process anim Blueprint that uses a virtual bone is used in the Skeletal Mesh and the virtual bone is deleted from the skeleton, crash occurs

-The Post Process Anim Blueprint is set in the Skeletal Mesh under Asset Details < Skeletal Mesh < Post Process Anim Blueprint

Steps to Reproduce

Download attached project
Open SubBlueprint (AnimBlueprint) and see that it references the Virtual Bone VB foot_l_foot_l
Open Skeleton
Delete VB foot_l_foot_l
See crash

Expected: Crash does not occur when the virtual bone is deleted from the skeleton

Result: Crash occurs when the virtual bone is deleted form the skeleton

Callstack

LoginId:bdcd2df1437ec38ad0d19c85e30ff2d1
EpicAccountId:1ed52ca976af4368b6c30d11b7cdc18f

Assertion failed: Index>=0 && Index<NumBits [File:D:\Build\++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\Core\Public\Containers/BitArray.h] [Line: 734]

UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:419]
UE4Editor_Engine!FBoneContainer::Contains() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\public\bonecontainer.h:292]
UE4Editor_Engine!FBoneReference::IsValidToEvaluate() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\bonecontainer.cpp:391]
UE4Editor_AnimGraphRuntime!FAnimNode_SkeletalControlBase::Update_AnyThread() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\animgraphruntime\private\bonecontrollers\animnode_skeletalcontrolbase.cpp:84]
UE4Editor_Engine!FPoseLinkBase::Update() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animnodebase.cpp:231]
UE4Editor_AnimGraphRuntime!FAnimNode_SkeletalControlBase::Update_AnyThread() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\animgraphruntime\private\bonecontrollers\animnode_skeletalcontrolbase.cpp:78]
UE4Editor_Engine!FPoseLinkBase::Update() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animnodebase.cpp:231]
UE4Editor_Engine!FPoseLinkBase::Update() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animnodebase.cpp:231]
UE4Editor_Engine!FAnimInstanceProxy::UpdateAnimationNode() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animinstanceproxy.cpp:41]
UE4Editor_Engine!FAnimInstanceProxy::UpdateAnimation() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animinstanceproxy.cpp:1013]
UE4Editor_Engine!UAnimInstance::UpdateAnimation() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animinstance.cpp:452]
UE4Editor_Engine!USkeletalMeshComponent::TickAnimation() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\components\skeletalmeshcomponent.cpp:987]
UE4Editor_Engine!USkeletalMeshComponent::InitAnim() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\components\skeletalmeshcomponent.cpp:643]
UE4Editor_Engine!USkeletalMeshComponent::OnRegister() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\components\skeletalmeshcomponent.cpp:494]
UE4Editor_Engine!UActorComponent::ExecuteRegisterEvents() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\components\actorcomponent.cpp:1239]
UE4Editor_Engine!FComponentReregisterContextBase::ReRegister() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\public\componentreregistercontext.h:68]
UE4Editor_Engine!USkeleton::HandleVirtualBoneChanges() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\skeleton.cpp:1602]
UE4Editor_SkeletonEditor!SSkeletonTree::DeleteVirtualBones() [d:\build\++ue4+release-4.19+compile\sync\engine\source\editor\skeletoneditor\private\sskeletontree.cpp:1884]
UE4Editor_SkeletonEditor!SSkeletonTree::OnDeleteSelectedRows() [d:\build\++ue4+release-4.19+compile\sync\engine\source\editor\skeletoneditor\private\sskeletontree.cpp:1835]
UE4Editor_SkeletonEditor!TBaseSPMethodDelegateInstance<0,SSkeletonTree,0,TTypeWrapper<void> __cdecl(void)>::Execute() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269]
UE4Editor_SkeletonEditor!TBaseSPMethodDelegateInstance<0,SSkeletonTree,0,void __cdecl(void)>::ExecuteIfSafe() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:345]
UE4Editor_Slate!FUICommandList::ExecuteAction() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:97]
UE4Editor_PinnedCommandList!FUICommandList_Pinnable::ExecuteAction() [d:\build\++ue4+release-4.19+compile\sync\engine\source\editor\pinnedcommandlist\private\uicommandlist_pinnable.cpp:12]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1028]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:988]
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64>::operator()<>() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:156]
UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64> >() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\templates\tuple.h:498]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void)>::Execute() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:282]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:385]
UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator()() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5440]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:266]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5429]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5927]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5907]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1726]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2172]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:889]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:726]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:129]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3263]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32
ntdll

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Fixed

Component	OLD - Anim
Affects Versions	4.18.3, 4.19, 4.20
Target Fix	4.20

Fix Commit	4112790
Main Commit	4124555
Release Commit	4112790

Created	Mar 22, 2018
Resolved	Jun 5, 2018
Updated	Jun 12, 2018

View Jira Issue

UE-56395

Crash Occurs When Deleting Virtual Bones that are Referenced in Post Process Anim Blueprint

Crash Occurs When Deleting Virtual Bones that are Referenced in Post Process Anim Blueprint

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