Description

Crash after adding an AI Perception component to a parent and child character. First they both must have had AI Perception components > Compiled and saved > Then both AI Perception components deleted > Compiled and saved

This is a regression:
Working in 4.16.3-3561208
Not working in 4.17.1-3586342

User Description: This sounds strange when explained as a test case, but the usecase for this would be reimplementing something in the parent class but forgetting to remove it from the child class and cleaning up after.

It also happened to me on a live project where I have Save after compilation, the editor did not crash, but refused to reopen after the editor was closed, also the project failed to compile using the RunUAT

Steps from Crash Reporter: - [TJ Ballard - EUS] Create child of TopdownCharacter > Add AIPerception component > Compile > Save > Add AIPerception component to the parent > Compile > Save > Delete AIPerception component from child > Compile > Save > Delete AIPerception component from parent > Compile > Save > Add AIPerception component back to the child > Crash

Steps to Reproduce
  1. Create a new actor blueprint
  2. Make a child of that blueprint
  3. Open the parent blueprint > Add an AIPerception component > Compile & save
  4. Open the child blueprint > Compile & save
  5. In the parent blueprint > Delete the AIPerception component
  6. In the child > Add a AIPerception component

Results: The editor will crash

Expected: For the AIPerception component to be added to the child bp

Callstack
UE4Editor_CoreUObject!UObject::Rename() [obj.cpp:198]
UE4Editor_Engine!UActorComponent::Rename() [actorcomponent.cpp:264]
UE4Editor_Engine!USimpleConstructionScript::CreateNode() [simpleconstructionscript.cpp:1268]
UE4Editor_Kismet!SSCSEditor::AddNewComponent() [sscseditor.cpp:5051]
UE4Editor_Kismet!SSCSEditor::PerformComboAddClass() [sscseditor.cpp:4194]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,SSCSEditor,0,UActorComponent * __ptr64 __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_UnrealEd!SComponentClassCombo::OnAddComponentSelectionChanged() [scomponentclasscombo.cpp:261]
UE4Editor_UnrealEd!TBaseSPMethodDelegateInstance<0,SComponentClassCombo,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_UnrealEd!TBaseSPMethodDelegateInstance<0,SComponentClassCombo,0,void __cdecl() [delegateinstancesimpl.h:434]
UE4Editor_UnrealEd!TBaseDelegate<void,TSharedPtr<FComponentClassComboEntry,0>,enum ESelectInfo::Type>::ExecuteIfBound() [delegatesignatureimpl.inl:624]
UE4Editor_UnrealEd!SListView<TSharedPtr<FComponentClassComboEntry,0> >::Private_SignalSelectionChanged() [slistview.h:725]
UE4Editor_UnrealEd!SComboRow<TSharedPtr<FString,0> >::OnMouseButtonDown() [scombobox.h:75]
UE4Editor_Slate!<lambda_7097b900f0e4be30d80fb18f98c51ea0>::operator() [slateapplication.cpp:5104]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_7097b900f0e4be30d80fb18f98c51ea0> >() [slateapplication.cpp:232]
UE4Editor_Slate!FSlateApplication::RoutePointerDownEvent() [slateapplication.cpp:5093]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDownEvent() [slateapplication.cpp:5050]
UE4Editor_Slate!FSlateApplication::OnMouseDown() [slateapplication.cpp:4968]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1726]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2161]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:881]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:721]
user32!<Unknown>
user32!<Unknown>
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3151]
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
Affects Versions4.174.18
Target Fix4.18
Fix Commit3656374
Main Commit3656992
Release Commit3656726
CreatedSep 14, 2017
ResolvedSep 21, 2017
UpdatedApr 27, 2018
View Jira Issue