Unreal Engine Issues and Bug Tracker (UE-42996)

Description

Editor Crashes when creating a function in Child Anim Blueprint.

Regression:
This issue did NOT occur in 4.13.2 Binary build

Steps to Reproduce

Create a new project using the third person template (No starter Content)
Navigate to the Third Person Character animation blueprint (Content > Mannequin > Animations)
Select ThirdPerson_AnimBP and create a child based off of it (Right click > Create child Blueprint class)
Name it Child_AnimBP > Open Child_AnimBP
Create a function
Result: Editor Crashes
Expected Result: A new function is created in the child anim

Callstack

UE4Editor-KismetCompiler.dylib!FAnimBlueprintCompiler::PostCompile() 
UE4Editor-KismetCompiler.dylib!FKismetCompilerContext::Compile() 
UE4Editor-KismetCompiler.dylib!FKismet2CompilerModule::CompileBlueprintInner(UBlueprint*, FKismetCompilerOptions const&, FCompilerResultsLog&, TSharedPtr<FBlue
UE4Editor-KismetCompiler.dylib!FKismet2CompilerModule::CompileBlueprint(UBlueprint*, FKismetCompilerOptions const&, FCompilerResultsLog&, TSharedPtr<FBlueprint
UE4Editor-UnrealEd.dylib!FBlueprintEditorUtils::MarkBlueprintAsStructurallyModified() 
UE4Editor-Kismet.dylib!void FBlueprintEditorUtils::AddFunctionGraph<UClass>() 
UE4Editor-Kismet.dylib!FBlueprintEditor::NewDocument_OnClicked() 
UE4Editor-Kismet.dylib!TBaseSPMethodDelegateInstance<false, FBlueprintEditor, (ESPMode)0, TTypeWrapper<void> (), FBlueprintEditor::ECreatedDocumentType
UE4Editor-Kismet.dylib!TBaseSPMethodDelegateInstance<false, FBlueprintEditor, (ESPMode)0, void (), FBlueprintEditor::ECreatedDocumentType>::ExecuteIfSa
UE4Editor-Slate.dylib!FUICommandList::ExecuteAction(TSharedRef<FUICommandInfo const,() 
UE4Editor-Kismet.dylib!SMyBlueprint::OnAddButtonClickedOnSection() 
UE4Editor-Kismet.dylib!TBaseSPMethodDelegateInstance<false, SMyBlueprint, (ESPMode)0, FReply (), int>::Execute() 
UE4Editor-Slate.dylib!SButton::OnMouseButtonUp() 
UE4Editor-Slate.dylib!FSlateApplication::RoutePointerUpEvent() 
UE4Editor-Slate.dylib!FSlateApplication::ProcessMouseButtonUpEvent() 
UE4Editor-Slate.dylib!FSlateApplication::OnMouseUp() 
UE4Editor-Core.dylib!FMacApplication::ProcessEvent() 
UE4Editor-Core.dylib!FMacApplication::ProcessDeferredEvents() 
UE4Editor-Slate.dylib!FSlateApplication::TickPlatform() 
UE4Editor-Slate.dylib!FSlateApplication::Tick() 
UE4Editor!FEngineLoop::Tick() 
UE4Editor!GuardedMain() 
UE4Editor!<Unknown> 
UE4Editor-Core.dylib!<Unknown> 
Foundation!Unknown() 
libsystem_pthread.dylib!<Unknown> 
libsystem_pthread.dylib!<Unknown> 
libsystem_pthread.dylib!<Unknown>

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Fixed

Component	OLD - Anim
Affects Versions	4.14.3, 4.15
Target Fix	4.16

Fix Commit	3351805
Main Commit	3362661

Created	Mar 16, 2017
Resolved	Mar 17, 2017
Updated	May 18, 2020