Unreal Engine Issues and Bug Tracker (UE-27316)

Developer Notes

Description

A user has reported a crash when attempting to use the 'Spawn Actor' node within his level blueprint.

I was able to follow the repro steps provided in the original answerhub post and get the crash to occur in versions 4.9.2, 4.10.4, and 4.11 preview 6.

The interesting thing I noticed was that this node is not present on Windows. when I went to test the crash to see if it was platform specific.

I have provided the user a workaround by using the Spawn Actor from Class, which is more than likely what he is trying to do anyway.

Steps to Reproduce

Open attached project
Open Level Blueprint
Create 'Spawn Actor' node off Event BeginPlay
Select MediaPlayer_BP (but class to spawn can be set to anything)
Compile Level Blueprint
Hit 'Play' or PIE

Tested and Crashed 4/4 times

Outcome Editor crashes as soon as you press play.

Expected Editor either spawns the given actor, or blueprint does not compile.

Callstack

UE4Editor-CoreUObject.dylib!CastLogError() 
UE4Editor-GameplayAbilities.dylib!UGameplayAbility* CastChecked<UGameplayAbility, UObject>() 
UE4Editor-GameplayAbilities.dylib!UAbilityTask_SpawnActor* UAbilityTask::NewAbilityTask<UAbilityTask_SpawnActor>() 
UE4Editor-GameplayAbilities.dylib!UAbilityTask_SpawnActor::SpawnActor() 
UE4Editor-GameplayAbilities.dylib!UAbilityTask_SpawnActor::execSpawnActor() 
UE4Editor-CoreUObject.dylib!UFunction::Invoke() 
UE4Editor-CoreUObject.dylib!UObject::CallFunction() 
UE4Editor-CoreUObject.dylib!UObject::ProcessContextOpcode() 
UE4Editor-CoreUObject.dylib!UObject::execLetObj() 
UE4Editor-CoreUObject.dylib!UObject::ProcessInternal() 
UE4Editor-CoreUObject.dylib!UFunction::Invoke() 
UE4Editor-CoreUObject.dylib!UObject::ProcessEvent() 
UE4Editor-Engine.dylib!AActor::BeginPlay() 
UE4Editor-Engine.dylib!AWorldSettings::NotifyBeginPlay() 
UE4Editor-Engine.dylib!AGameMode::HandleMatchHasStarted() 
UE4Editor-Engine.dylib!AGameMode::SetMatchState() 
UE4Editor-Engine.dylib!UWorld::BeginPlay() 
UE4Editor-Engine.dylib!UGameInstance::StartPIEGameInstance() 
UE4Editor-UnrealEd.dylib!UEditorEngine::CreatePIEGameInstance() 
UE4Editor-UnrealEd.dylib!UEditorEngine::PlayInEditor() 
UE4Editor-UnrealEd.dylib!UEditorEngine::StartQueuedPlayMapRequest() 
UE4Editor-UnrealEd.dylib!UEditorEngine::Tick() 
UE4Editor-UnrealEd.dylib!UUnrealEdEngine::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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