Unreal Engine Issues and Bug Tracker (UE-22777)

Description

Setting a UMG widget to be added to viewport when a volume is overlapped though code and creating a blueprint of this class causes the editor to crash when the blueprint is opened if the BP has a static mesh set inside the volume.

Steps to Reproduce

Download attached header/source file
Create a new project named TestUserWidget
Move files into TestUserWidget's Source folder and Generate Project Files
Open project and create a blueprint based on UWActor
Set the Static Mesh Component to any Mesh
Save and close the blueprint
Double click on the blueprint to reopen

Result:
The editor crashes when attempting to re-open the blueprint

Callstack

MachineId:9FA88CA44B7C623122B0039D6C8BA1B0
EpicAccountId:c807849e05a0413d99e379f2802cae9c

Access violation - code c0000005 (first/second chance not available)

""

UE4Editor_UMG!UUserWidget::AddToScreen() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\umg\private\userwidget.cpp:465]
UE4Editor_TestUserWidget!AUWActor::execOnOverlapBegin() [d:\projects\userprojects\uistuff\testuserwidget\source\testuserwidget\uwactor.h:11]
UE4Editor_CoreUObject!UFunction::Invoke() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\coreuobject\private\uobject\class.cpp:4195]
UE4Editor_CoreUObject!UObject::ProcessEvent() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1046]
UE4Editor_Engine!AActor::ProcessEvent() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\actor.cpp:580]
UE4Editor_Engine!TMulticastScriptDelegate<FWeakObjectPtr>::ProcessMulticastDelegate<UObject>() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\core\public\uobject\scriptdelegates.h:459]
UE4Editor_Engine!FComponentBeginOverlapSignature_DelegateWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\classes\components\primitivecomponent.h:96]
UE4Editor_Engine!UPrimitiveComponent::BeginComponentOverlap() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\components\primitivecomponent.cpp:2011]
UE4Editor_Engine!UPrimitiveComponent::UpdateOverlaps() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\components\primitivecomponent.cpp:2457]
UE4Editor_Engine!UPrimitiveComponent::UpdateOverlaps() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\components\primitivecomponent.cpp:2481]
UE4Editor_Engine!AActor::PostActorConstruction() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\actor.cpp:2679]
UE4Editor_Engine!AActor::FinishSpawning() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\actor.cpp:2578]
UE4Editor_Engine!AActor::PostSpawnInitialize() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\actor.cpp:2534]
UE4Editor_Engine!UWorld::SpawnActor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\levelactor.cpp:430]
UE4Editor_Engine!UWorld::SpawnActor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\levelactor.cpp:267]
UE4Editor_Kismet!FBlueprintEditor::UpdatePreviewActor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\editor\kismet\private\blueprinteditor.cpp:7437]
UE4Editor_Kismet!FBlueprintEditor::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\editor\kismet\private\blueprinteditor.cpp:6416]
UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\editor\unrealed\public\tickableeditorobject.h:15]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\editor\unrealed\private\editorengine.cpp:1116]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\editor\unrealed\private\unrealedengine.cpp:366]
UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\launch\private\launchengineloop.cpp:2428]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]

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Cannot Reproduce

Component	UE - Editor - UI Systems
Affects Versions	4.9.2, 4.10
Target Fix	4.13

Created	Oct 30, 2015
Resolved	Jul 11, 2016
Updated	Apr 11, 2019

View Jira Issue

UE-22777

Adding widget to viewport on code overlap event causes the editor to crash when opening child blueprint

Adding widget to viewport on code overlap event causes the editor to crash when opening child blueprint

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