Unreal Engine Issues

UE-54045

Animation Blueprint Editor Crashes on Compile if the Debug Instance Selection is Other Than No Object or Preview Instance

Animation Blueprint Editor Crashes on Compile if the Debug Instance Selection is Other Than No Object or Preview Instance

Description

-Crash occurs when debug is set, and anim Blueprint is compiled while actor blueprint is selected
-When reopening project, imported assets are no longer there
-Reopening project after crash, the options under the Debug filter are gone and cannot reproduce crash again

Steps to Reproduce
  1. Download attached asset
  2. Create an empty 4.18 project
  3. Import the attached asset with Import Animation enabled
  4. Create an new anim Blueprint for the downloaded asset
  5. Add New State Machine
  6. Add new state for the asset's animation
  7. Compile/Save
  8. Create a new Actor Blueprint
  9. Create a skeletal mesh component
  10. Add AnimatedSphere mesh to the component
  11. Add the animation Blueprint that was created
  12. Compile/Save
  13. Bring the Actor Blueprint into the Level
  14. Reopen the Anim Blueprint
  15. Change the Debug Filter in the anim Blueprint to a random instance
  16. Compile
  17. See crash
Callstack
LoginId:bdcd2df1437ec38ad0d19c85e30ff2d1
EpicAccountId:1ed52ca976af4368b6c30d11b7cdc18f

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

UE4Editor_CoreUObject!UObjectBaseUtility::IsA() [d:\main workspace\engine\source\runtime\coreuobject\private\uobject\uobjectbaseutility.cpp:278]
UE4Editor_Engine!UBlueprint::SetObjectBeingDebugged() [d:\main workspace\engine\source\runtime\engine\private\blueprint.cpp:850]
UE4Editor_AnimationBlueprintEditor!FAnimationBlueprintEditor::Compile() [d:\main workspace\engine\source\editor\animationblueprinteditor\private\animationblueprinteditor.cpp:1059]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl(void)>::Execute() [d:\main workspace\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl(void)>::ExecuteIfSafe() [d:\main workspace\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:345]
UE4Editor_Slate!FUICommandList::ExecuteAction() [d:\main workspace\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:97]
UE4Editor_Slate!SToolBarButtonBlock::OnClicked() [d:\main workspace\engine\source\runtime\slate\private\framework\multibox\stoolbarbuttonblock.cpp:300]
UE4Editor_Slate!TMemberFunctionCaller<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(void) __ptr64>::operator()<>() [d:\main workspace\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:156]
UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(void) __ptr64> >() [d:\main workspace\engine\source\runtime\core\public\templates\tuple.h:498]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl(void)>::Execute() [d:\main workspace\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\main workspace\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\main workspace\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:282]
UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator()() [d:\main workspace\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5435]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [d:\main workspace\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:266]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\main workspace\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5424]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\main workspace\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5922]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\main workspace\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5902]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [d:\main workspace\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1726]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [d:\main workspace\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2172]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [d:\main workspace\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:889]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [d:\main workspace\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:726]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [d:\main workspace\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:129]
UE4Editor!FEngineLoop::Tick() [d:\main workspace\engine\source\runtime\launch\private\launchengineloop.cpp:3244]
UE4Editor!GuardedMain() [d:\main workspace\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\main workspace\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\main workspace\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32
ntdll

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Fixed
ComponentOLD - Anim
Affects Versions4.17.2, 4.18.2, 4.20
Target Fix4.19
Fix Commit3845472
Main Commit3990065
Release Commit3845472
CreatedJan 15, 2018
ResolvedJan 19, 2018
UpdatedApr 27, 2018
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