Description

Engine crashes if Blend Multi node output is connected to final transition node, and no input is connected to Blend Multi node input parameters.

 

[Image Removed]

Steps to Reproduce
  1. Open Unreal Engine 4.21
  2. Create a new Blueprint project based off of First Person Template
  3. In the content folder-> Right click and create a new Animation Blueprint
  4. Right click on the Animation Graph, and create a Blend Multi Node.
  5. Connect output of "Blend Multi" node to input of "Final Animation Pose" node
  6.  Compile and Save

Expected:  A Warning for null or Ignore.

Result: Engine Crashes

Callstack

LoginId:fefbabe64c2e0c4a43f0439790007b14 EpicAccountId:e5d1a8d997c146e7881b4b49842e4883 Assertion failed: Unable to render embedded object: File (//jira.it.epicgames.net/images/icons/emoticons/biggrin.png" height="16" width="16" align="absmiddle" alt="" border="0"/>:\Build++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\Engine\Private\Animation\AnimNodeBase.cpp] [Line: 146] Initialize already in progress, circular link for AnimInstance [NewAnimBlueprint_C /Engine/Transient.World_0:PersistentLevel.SkeletalMeshActor_0.SkeletalMeshComponent0.NewAnimBlueprint_C_5] Blueprint [AnimBlueprintGeneratedClass /Game/FirstPersonBP/NewAnimBlueprint.NewAnimBlueprint_C] UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:419] UE4Editor_Engine!FPoseLinkBase::Initialize() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animnodebase.cpp:145] UE4Editor_Engine!FPoseLinkBase::Initialize() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animnodebase.cpp:162] UE4Editor_AnimGraphRuntime!FAnimNode_MultiWayBlend::Initialize_AnyThread() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\animgraphruntime\private\animnodes\animnode_multiwayblend.cpp:30] UE4Editor_Engine!FPoseLinkBase::Initialize() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animnodebase.cpp:162] UE4Editor_Engine!FAnimInstanceProxy::InitializeRootNode() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animinstanceproxy.cpp:234] UE4Editor_Engine!UAnimInstance::InitializeAnimation() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\animation\animinstance.cpp:208] UE4Editor_Engine!USkeletalMeshComponent::InitializeAnimScriptInstance() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\components\skeletalmeshcomponent.cpp:685] UE4Editor_Engine!USkeletalMeshComponent::InitAnim() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\components\skeletalmeshcomponent.cpp:630] UE4Editor_UnrealEd!ReplaceObjectHelper() [d:\build++ue4+release-4.19+compile\sync\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:1670] UE4Editor_UnrealEd!FBlueprintCompileReinstancer::ReplaceInstancesOfClass_Inner() [d:\build++ue4+release-4.19+compile\sync\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:1958] UE4Editor_UnrealEd!FBlueprintCompileReinstancer::BatchReplaceInstancesOfClass() [d:\build++ue4+release-4.19+compile\sync\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:1478] UE4Editor_Kismet!FBlueprintCompilationManagerImpl::FlushReinstancingQueueImpl() [d:\build++ue4+release-4.19+compile\sync\engine\source\editor\kismet\private\blueprintcompilationmanager.cpp:1067] UE4Editor_Kismet!FBlueprintCompilationManagerImpl::CompileSynchronouslyImpl() [d:\build++ue4+release-4.19+compile\sync\engine\source\editor\kismet\private\blueprintcompilationmanager.cpp:203] UE4Editor_UnrealEd!FKismetEditorUtilities::CompileBlueprint() [d:\build++ue4+release-4.19+compile\sync\engine\source\editor\unrealed\private\kismet2\kismet2.cpp:741] UE4Editor_Kismet!FBlueprintEditor::Compile() [d:\build++ue4+release-4.19+compile\sync\engine\source\editor\kismet\private\blueprinteditor.cpp:3180] UE4Editor_AnimationBlueprintEditor!FAnimationBlueprintEditor::Compile() [d:\build++ue4+release-4.19+compile\sync\engine\source\editor\animationblueprinteditor\private\animationblueprinteditor.cpp:1051] UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl(void)>::Execute() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269] UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,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_Slate!SToolBarButtonBlock::OnClicked() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\slate\private\framework\multibox\stoolbarbuttonblock.cpp:300] UE4Editor_Slate!TMemberFunctionCaller<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(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<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(void) __ptr64> >() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\templates\tuple.h:498] UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,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) not found.<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:144] UE4Editor!WinMain() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:223] UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253] kernel32 ntdll

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Fixed
ComponentAnim - Animation
Affects Versions4.194.204.214.22
Target Fix4.22
Fix Commit4939012
Main Commit4939014
Release Commit4939012
CreatedNov 30, 2018
ResolvedFeb 7, 2019
UpdatedFeb 16, 2019