Unreal Engine Issues and Bug Tracker (UE-63375)

Description

Changing area light settings in blueprint will Cause a crash.

Found in 4.20 CL# 4302132 and 4.21 CL# 4307852

Unable to test in 4.19 due to provided project being in 4.20

Steps to Reproduce

Open the attached project
Select one of the light blueprints in the level
Open the blueprint and edit the light color or intensity in the construction script

Results:
The Editor will crash

Expected:
The settings of the light will change with no crash

Callstack

Assertion failed: SubObjectHierarchyID.Num() > 0 [File:D:\Main\Engine\Source\Editor\UnrealEd\Private\EditorTransaction.cpp] [Line: 566]

UE4Editor_Core!FDebug::AssertFailed() [d:\main\engine\source\runtime\core\private\misc\assertionmacros.cpp:425]
UE4Editor_UnrealEd!FTransaction::FObjectRecord::FPersistentObjectRef::Get() [d:\main\engine\source\editor\unrealed\private\editortransaction.cpp:569]
UE4Editor_UnrealEd!<lambda_c4b0656be3e3b85979134570765a455a>::operator()() [d:\main\engine\source\editor\unrealed\private\editortransaction.cpp:352]
UE4Editor_UnrealEd!FTransaction::FObjectRecord::Diff() [d:\main\engine\source\editor\unrealed\private\editortransaction.cpp:372]
UE4Editor_UnrealEd!FTransaction::FObjectRecord::Snapshot() [d:\main\engine\source\editor\unrealed\private\editortransaction.cpp:326]
UE4Editor_UnrealEd!FTransaction::SnapshotObject() [d:\main\engine\source\editor\unrealed\private\editortransaction.cpp:719]
UE4Editor_CoreUObject!SnapshotTransactionBuffer() [d:\main\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:2239]
UE4Editor_CoreUObject!UObject::PostEditChangeProperty() [d:\main\engine\source\runtime\coreuobject\private\uobject\obj.cpp:347]
UE4Editor_Engine!AActor::PostEditChangeProperty() [d:\main\engine\source\runtime\engine\private\actoreditor.cpp:137]
UE4Editor_CoreUObject!UObject::PostEditChangeChainProperty() [d:\main\engine\source\runtime\coreuobject\private\uobject\obj.cpp:444]
UE4Editor_CoreUObject!UObject::PropagatePostEditChange() [d:\main\engine\source\runtime\coreuobject\private\uobject\obj.cpp:518]
UE4Editor_CoreUObject!UObject::PostEditChangeChainProperty() [d:\main\engine\source\runtime\coreuobject\private\uobject\obj.cpp:411]
UE4Editor_PropertyEditor!FPropertyNode::NotifyPostChange() [d:\main\engine\source\editor\propertyeditor\private\propertynode.cpp:2122]
UE4Editor_PropertyEditor!FPropertyValueImpl::ImportText() [d:\main\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:545]
UE4Editor_PropertyEditor!FPropertyValueImpl::ImportText() [d:\main\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:333]
UE4Editor_PropertyEditor!FPropertyValueImpl::SetValueAsString() [d:\main\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:840]
UE4Editor_DetailCustomizations!FColorStructCustomization::OnSetColorFromColorPicker() [d:\main\engine\source\editor\detailcustomizations\private\colorstructcustomization.cpp:287]
UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,FColorStructCustomization,0,void __cdecl(FLinearColor)>::ExecuteIfSafe() [d:\main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:345]
UE4Editor_AppFramework!TBaseDelegate<void,FLinearColor>::ExecuteIfBound() [d:\main\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:652]
UE4Editor_AppFramework!SColorPicker::UpdateColorPick() [d:\main\engine\source\runtime\appframework\private\widgets\colors\scolorpicker.cpp:790]
UE4Editor_AppFramework!SColorPicker::UpdateColorPickMouseUp() [d:\main\engine\source\runtime\appframework\private\widgets\colors\scolorpicker.cpp:776]
UE4Editor_AppFramework!SColorPicker::ApplyNewTargetColor() [d:\main\engine\source\runtime\appframework\private\widgets\colors\scolorpicker.cpp:756]
UE4Editor_AppFramework!SColorPicker::SetNewTargetColorHSV() [d:\main\engine\source\runtime\appframework\private\widgets\colors\scolorpicker.cpp:736]
UE4Editor_AppFramework!TBaseSPMethodDelegateInstance<0,SColorPicker const ,0,TTypeWrapper<void> __cdecl(float),enum EColorPickerChannels>::Execute() [d:\main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269]
UE4Editor_AppFramework!TBaseSPMethodDelegateInstance<0,SColorPicker const ,0,void __cdecl(float),enum EColorPickerChannels>::ExecuteIfSafe() [d:\main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:345]
UE4Editor_Slate!SSlider::CommitValue() [d:\main\engine\source\runtime\slate\private\widgets\input\sslider.cpp:288]
UE4Editor_Slate!SSlider::OnMouseMove() [d:\main\engine\source\runtime\slate\private\widgets\input\sslider.cpp:272]
UE4Editor_Slate!<lambda_7de95b7e89c1166609803466904a610a>::operator()() [d:\main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5743]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_7de95b7e89c1166609803466904a610a> >() [d:\main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:270]
UE4Editor_Slate!FSlateApplication::RoutePointerMoveEvent() [d:\main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5747]
UE4Editor_Slate!FSlateApplication::ProcessMouseMoveEvent() [d:\main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6196]
UE4Editor_Slate!FSlateApplication::OnMouseMove() [d:\main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6130]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [d:\main\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1775]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [d:\main\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2183]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [d:\main\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:894]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [d:\main\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:731]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [d:\main\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:130]
UE4Editor!FEngineLoop::Tick() [d:\main\engine\source\runtime\launch\private\launchengineloop.cpp:3473]
UE4Editor!GuardedMain() [d:\main\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\main\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
UE4Editor!WinMain() [d:\main\engine\source\runtime\launch\private\windows\launchwindows.cpp:276]
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 - Enterprise
Affects Versions	4.20, 4.21
Target Fix	4.20e3, 4.20.3

Fix Commit	4369336

Created	Aug 27, 2018
Resolved	Sep 17, 2018
Updated	Sep 18, 2018

UE-63375

Changing Area Light Settings In Blueprint Causes Crash

Changing Area Light Settings In Blueprint Causes Crash

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