Description
  1. If you open the 6 assets that were close unexpectedly it will crash
  2. Enemy (Blueprint), Player_BP (Blueprint) and ThirdPersonGameMode (Blueprint) it crashes
  3. The texture and Projectile_Base (Blueprint) are fine
  4. If you try to open SK_Mannequin it doesn't crash
  5. If you open Ch15_nonPBR it does cause the crash
Steps to Reproduce

Link to Project [Link Removed]

  1. Open the project in 4.25 or 4.26
    Result: Editor crashes due to Skeletal Mesh being called upon.
    Expected: Able to access project without it crashing.

WORKAROUND to Debug more:

  1. Open DefaultEngine.ini and comment out the EditorStartupMap and GameDefaultMap
  2. Open the project in the editor
Callstack
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000000000000003c
[Callstack] 0x00007ffd647e3dc0 UE4Editor-Engine.dll!USkeletalMeshComponent::ComputeRequiredBones() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Components\SkeletalMeshComponent.cpp:1764]
[Callstack] 0x00007ffd64800781 UE4Editor-Engine.dll!USkeletalMeshComponent::RecalcRequiredBones() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Components\SkeletalMeshComponent.cpp:1817]
[Callstack] 0x00007ffd647f40e6 UE4Editor-Engine.dll!USkeletalMeshComponent::InitAnim() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Components\SkeletalMeshComponent.cpp:744]
[Callstack] 0x00007ffd647fb3f9 UE4Editor-Engine.dll!USkeletalMeshComponent::OnRegister() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Components\SkeletalMeshComponent.cpp:540]
[Callstack] 0x00007ffd6470bb0a UE4Editor-Engine.dll!UActorComponent::ExecuteRegisterEvents() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Components\ActorComponent.cpp:1525]
[Callstack] 0x00007ffd6473e577 UE4Editor-Engine.dll!UActorComponent::RegisterComponentWithWorld() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Components\ActorComponent.cpp:1223]
[Callstack] 0x00007ffd6433f2d2 UE4Editor-Engine.dll!AActor::IncrementalRegisterComponents() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Actor.cpp:4619]
[Callstack] 0x00007ffd64c3e76f UE4Editor-Engine.dll!ULevel::IncrementalUpdateComponents() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Level.cpp:1097]
[Callstack] 0x00007ffd656eec20 UE4Editor-Engine.dll!UWorld::UpdateWorldComponents() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\World.cpp:1963]
[Callstack] 0x00007ffd60ca2420 UE4Editor-UnrealEd.dll!UEditorEngine::Map_Load() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:2771]
[Callstack] 0x00007ffd60c918ef UE4Editor-UnrealEd.dll!UEditorEngine::HandleMapCommand() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:6204]
[Callstack] 0x00007ffd60c7acaf UE4Editor-UnrealEd.dll!UEditorEngine::Exec() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:5705]
[Callstack] 0x00007ffd614fabb7 UE4Editor-UnrealEd.dll!UUnrealEdEngine::Exec() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdSrv.cpp:697]
[Callstack] 0x00007ffd61009979 UE4Editor-UnrealEd.dll!FEditorFileUtils::LoadMap() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\FileHelpers.cpp:2554]
[Callstack] 0x00007ffd61009788 UE4Editor-UnrealEd.dll!FEditorFileUtils::LoadDefaultMapAtStartup() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\FileHelpers.cpp:4043]
[Callstack] 0x00007ffd61537680 UE4Editor-UnrealEd.dll!FUnrealEdMisc::OnInit() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdMisc.cpp:359]
[Callstack] 0x00007ffd614f6694 UE4Editor-UnrealEd.dll!EditorInit() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdGlobals.cpp:115]
[Callstack] 0x00007ff6c7dd0fbb UE4Editor.exe!GuardedMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:149]
[Callstack] 0x00007ff6c7dd121a UE4Editor.exe!GuardedMainWrapper() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
[Callstack] 0x00007ff6c7de527d UE4Editor.exe!WinMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
[Callstack] 0x00007ff6c7de7faa UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
[Callstack] 0x00007ffdd29b7034 KERNEL32.DLL!UnknownFunction []
[Callstack] 0x00007ffdd3a7d0d1 ntdll.dll!UnknownFunction []

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Unresolved
ComponentAnim - Runtime
Affects Versions4.254.26
Target Fix5.0-m5
CreatedJan 6, 2021
UpdatedJan 8, 2021