Unreal Engine Issues

UE-44661

Crash Occurs When Setting Child Actor Class in Child Blueprint

Crash Occurs When Setting Child Actor Class in Child Blueprint

UDN
Description

A crash occurs when setting the Child Actor Class of an inherited child actor component.

This is not a regression. It occurs in 4.14.3 CL# 3249277, 4.15.2 CL# 3416026, and 4.16 Preview 2 CL# 3415565

Steps to Reproduce
  1. Open the editor
  2. Create a new Actor BP (TestActorParent)
  3. In TestActorParent, add a Child Actor Component
  4. Right click on TestActorParent and Create Child Blueprint Class (TestActorChild)
  5. In TestActorChild's Construction Script, add a Set Child Actor Class node and set In Class to TestActorParent
  6. In TestActorChild, select the ChildActorComponent. In the Details panel, set the Child Actor Class to Abstract Nav Data

Result: Editor Crashes

Callstack

Fatal error: [Link Removed] [Line: 2360] Objects have the same fully qualified name but different paths. New Object: TestActorParent_C /Engine/Transient.World_5:PersistentLevel.TestActorParent_C_9 Existing Object: AbstractNavData /Engine/Transient.World_5:PersistentLevel.TestActorParent_C_9

UE4Editor_CoreUObject!StaticAllocateObject() uobjectglobals.cpp:2355 
UE4Editor_CoreUObject!StaticConstructObject_Internal() uobjectglobals.cpp:3265 
UE4Editor_Engine!NewObject<AActor>() uobjectglobals.h:1235 
UE4Editor_Engine!UWorld::SpawnActor() levelactor.cpp:425 
UE4Editor_Engine!UWorld::SpawnActor() levelactor.cpp:291 
UE4Editor_Engine!UChildActorComponent::CreateChildActor() childactorcomponent.cpp:500 
UE4Editor_Engine!UActorComponent::ExecuteRegisterEvents() actorcomponent.cpp:1201 
UE4Editor_Engine!FComponentReregisterContextBase::ReRegister() componentreregistercontext.h:72 
UE4Editor_Engine!UActorComponent::ReregisterComponent() actorcomponent.cpp:1243 
UE4Editor_Engine!FActorComponentInstanceData::ApplyToComponent() componentinstancedatacache.cpp:196 
UE4Editor_Engine!FSceneComponentInstanceData::ApplyToComponent() scenecomponent.cpp:2068 
UE4Editor_Engine!FChildActorComponentInstanceData::ApplyToComponent() childactorcomponent.cpp:256 
UE4Editor_Engine!FComponentInstanceDataCache::ApplyToActor() componentinstancedatacache.cpp:284 
UE4Editor_Engine!AActor::ExecuteConstruction() actorconstruction.cpp:780 
UE4Editor_Engine!AActor::RerunConstructionScripts() actorconstruction.cpp:490 
UE4Editor_Engine!UActorComponent::ConsolidatedPostEditChange() actorcomponent.cpp:632 
UE4Editor_Engine!USceneComponent::PostEditChangeProperty() scenecomponent.cpp:435 
UE4Editor_CoreUObject!UObject::PropagatePostEditChange() obj.cpp:500 
UE4Editor_CoreUObject!UObject::PostEditChangeChainProperty() obj.cpp:388 
UE4Editor_Engine!UActorComponent::PostEditChangeChainProperty() actorcomponent.cpp:670 
UE4Editor_PropertyEditor!FPropertyNode::NotifyPostChange() propertynode.cpp:2368 
UE4Editor_PropertyEditor!FPropertyValueImpl::ImportText() propertyhandleimpl.cpp:561 
UE4Editor_PropertyEditor!FPropertyValueImpl::ImportText() propertyhandleimpl.cpp:361 
UE4Editor_PropertyEditor!FPropertyValueImpl::SetValueAsString() propertyhandleimpl.cpp:832 
UE4Editor_PropertyEditor!FPropertyHandleObject::SetValueFromFormattedString() propertyhandleimpl.cpp:3244 
UE4Editor_PropertyEditor!SPropertyEditorClass::SendToObjects() spropertyeditorclass.cpp:250 
UE4Editor_PropertyEditor!SPropertyEditorClass::OnClassPicked() spropertyeditorclass.cpp:239 
UE4Editor_PropertyEditor!TBaseRawMethodDelegateInstance<0,SPropertyEditorClass,void __cdecl() delegateinstancesimpl.h:648 
UE4Editor_ClassViewer!SClassViewer::OnClassViewerSelectionChanged() sclassviewer.cpp:2428 
UE4Editor_ClassViewer!TBaseSPMethodDelegateInstance<0,SClassViewer,0,TTypeWrapper<void> __cdecl() delegateinstancesimpl.h:327 
UE4Editor_ClassViewer!TBaseSPMethodDelegateInstance<0,SClassViewer,0,void __cdecl() delegateinstancesimpl.h:434 
UE4Editor_ClassViewer!TBaseDelegate<void,TSharedPtr<FClassViewerNode,0>,enum ESelectInfo::Type>::ExecuteIfBound() delegatesignatureimpl.inl:624 
UE4Editor_ClassViewer!SListView<TSharedPtr<FClassViewerNode,0> >::Private_SignalSelectionChanged() slistview.h:720 
UE4Editor_ClassViewer!STableRow<TSharedPtr<FString,0> >::OnMouseButtonUp() stablerow.h:473 
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() slateapplication.cpp:5075 
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() slateapplication.cpp:238 
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() slateapplication.cpp:5064 
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() slateapplication.cpp:5531 
UE4Editor_Slate!FSlateApplication::OnMouseUp() slateapplication.cpp:5508 
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1698 
UE4Editor_Core!FWindowsApplication::DeferMessage() windowsapplication.cpp:2120 
UE4Editor_Core!FWindowsApplication::ProcessMessage() windowsapplication.cpp:867 
UE4Editor_Core!FWindowsApplication::AppWndProc() windowsapplication.cpp:714 
user32!<Unknown> 
user32!<Unknown> 
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() windowsplatformmisc.cpp:980 
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2977 
UE4Editor!GuardedMain() launch.cpp:166 
UE4Editor!GuardedMainWrapper() launchwindows.cpp:134 
UE4Editor!WinMain() launchwindows.cpp:210 
UE4Editor!__scrt_common_main_seh() exe_common.inl:253 
kernel32!<Unknown> 
ntdll!<Unknown>

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Fixed
ComponentUE - Gameplay - Blueprint
Affects Versions4.14, 4.15, 4.16
Target Fix4.17
Fix Commit3516637
Main Commit3544050
Release Commit3525166
CreatedMay 4, 2017
ResolvedJun 29, 2017
UpdatedJul 19, 2017
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