C++ Defined Actor Sequence Component Crashes on editor view


This was happening in 4.16 as well but if you have a UActorSequenceComponent defined in C++, then have a blueprint derived from that C++ class, upon selecting the Sequence Component the editor will immediately crash.

I’ve attached an example project that should show you what happens but if you don’t want that:

Steps to Reproduce

  • Enable ActorSequenceEditor plugin
  • Create a C++ derived Actor
  • Create and add the component in C++

The usual way

UPROPERTY(VisibleDefaultsOnly, BlueprintReadOnly)
UActorSequenceComponent* SequenceComponent;
SequenceComponent = CreateDefaultSubobject<UActorSequenceComponent>(FName("Sequence Comp"));
  • Create Blueprint derived from the newly created actor class
  • Open Blueprint and select the component in the hierarchy

Should crash due to a nullptr with Get Parent Blueprint in UActorSequence

UE4Editor-CoreUObject.dll!UObjectBaseUtility::GetTypedOuter() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectbaseutility.cpp:205]
UE4Editor-ActorSequence.dll!UActorSequence::GetParentBlueprint() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\actorsequence\private\actorsequence.cpp:45]
UE4Editor-ActorSequenceEditor.dll!FActorSequenceComponentCustomization::CustomizeDetails() [d:\build\++ue4+release-4.17+compile\sync\engine\plugins\moviescene\actorsequenceeditor\source\actorsequenceeditor\private\actorsequencecomponentcustomization.cpp:136]

I have attached a crash log as well as the project I have reproduced it in.


Hey Kanibel-

Thank you for submitting a bug report. I have reproduced this issue and logged a report for it here Unreal Engine Issues and Bug Tracker (UE-49103) . You can track the report’s status as the issue is reviewed by our development staff. Please be aware that this issue may not be prioritized or fixed soon.