Description

Skeletal animations are finalized at the end of recording, and expect the actor to still be around, but actors can despawn during recording leading to a crash.

Steps to Reproduce
  1. Create a sequence with a spawnable mannequin
  2. Animate the spawn track so the mannequin spawns a few frames in to the sequence.
  3. Add an animation to the mannequin
  4. Add a Level Sequence source to take recorder, and add the sequence from step 1 to the list of sequences to trigger
  5. Add a source for nearby spawned actors
  6. PIE
  7. Record a take
  8. Wait for the skeletal mesh actor source to become Actor (none) and stop recording

RESULT

The editor crashes

Callstack

Fatal error!

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000000000000050c

0x00007ffb5958de16 UE4Editor-CoreUObject.dll!FWeakObjectPtr::Get() [D:\_Release-4.26\Engine\Source\Runtime\CoreUObject\Private\UObject\WeakObjectPtr.cpp:81]
0x00007ffb4be307a0 UE4Editor-SequenceRecorder.dll!FAnimationRecorder::ProcessRecordedTimes() [D:\_Release-4.26\Engine\Source\Editor\SequenceRecorder\Private\AnimationRecorder.cpp:505]
0x00007ffb326f8a07 UE4Editor-TakeTrackRecorders.dll!UMovieSceneAnimationTrackRecorder::ProcessRecordedTimes() [D:\_Release-4.26\Engine\Plugins\VirtualProduction\Takes\Source\TakeTrackRecorders\Private\MovieSceneAnimationTrackRecorder.cpp:318]
0x00007ffb32635962 UE4Editor-TakeRecorderSources.dll!UTakeRecorderActorSource::PostProcessTrackRecorders() [D:\_Release-4.26\Engine\Plugins\VirtualProduction\Takes\Source\TakeRecorderSources\Private\TakeRecorderActorSource.cpp:854]
0x00007ffb32635f3c UE4Editor-TakeRecorderSources.dll!UTakeRecorderActorSource::PostRecording() [D:\_Release-4.26\Engine\Plugins\VirtualProduction\Takes\Source\TakeRecorderSources\Private\TakeRecorderActorSource.cpp:742]
0x00007ffb32797d28 UE4Editor-TakesCore.dll!UTakeRecorderSources::StopRecording() [D:\_Release-4.26\Engine\Plugins\VirtualProduction\Takes\Source\TakesCore\Private\TakeRecorderSources.cpp:562]
0x00007ffb31ac4965 UE4Editor-TakeRecorder.dll!UTakeRecorder::Stop() [D:\_Release-4.26\Engine\Plugins\VirtualProduction\Takes\Source\TakeRecorder\Private\Recorder\TakeRecorder.cpp:880]
0x00007ffb31a55793 UE4Editor-TakeRecorder.dll!STakeRecorderNotification::ButtonClicked() [D:\_Release-4.26\Engine\Plugins\VirtualProduction\Takes\Source\TakeRecorder\Private\Recorder\TakeRecorder.cpp:266]
0x00007ffb31a7c7ee UE4Editor-TakeRecorder.dll!TBaseSPMethodDelegateInstance<0,STakeRecorderNotification,0,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() [D:\_Release-4.26\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
0x00007ffb57fbc2ae UE4Editor-Slate.dll!SButton::ExecuteOnClick() [D:\_Release-4.26\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385]
0x00007ffb57fd47b2 UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [D:\_Release-4.26\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304]
0x00007ffb57e147be UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_cc5aea9e7377b04ce85c30c65ec3889b> >() [D:\_Release-4.26\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:378]
0x00007ffb57e986b4 UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [D:\_Release-4.26\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4815]
0x00007ffb57e80a37 UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [D:\_Release-4.26\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5356]
0x00007ffb57e73d72 UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [D:\_Release-4.26\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5321]
0x00007ffba379bdb7 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\_Release-4.26\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2178]
0x00007ffba3789227 UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\_Release-4.26\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2642]
0x00007ffba379e3fe UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\_Release-4.26\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1046]
0x00007ffba37843d0 UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\_Release-4.26\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:878]
0x00007ffbcc9fe858 USER32.dll!UnknownFunction []
0x00007ffbcc9fe299 USER32.dll!UnknownFunction []
0x00007ffba379fa04 UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\_Release-4.26\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
0x00007ff63a668857 UE4Editor.exe!FEngineLoop::Tick() [D:\_Release-4.26\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4748]
0x00007ff63a6811dc UE4Editor.exe!GuardedMain() [D:\_Release-4.26\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
0x00007ff63a6812ba UE4Editor.exe!GuardedMainWrapper() [D:\_Release-4.26\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
0x00007ff63a69528d UE4Editor.exe!WinMain() [D:\_Release-4.26\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
0x00007ff63a697faa UE4Editor.exe!__scrt_common_main_seh() [D:\agent\_work\9\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
0x00007ffbcbda7034 KERNEL32.DLL!UnknownFunction []
0x00007ffbcdb3d241 ntdll.dll!UnknownFunction []

Community References

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Fixed
ComponentUE - Anim - Sequencer
Target Fix4.26.2
Fix Commit15689012
Main Commit15797488
Release Commit15689012
CreatedMar 8, 2021
ResolvedMar 12, 2021
UpdatedMay 11, 2021