Description

When duplicating multiple components at once it appears to crash the editor.

Regression: Yes, this appears to be working in the previous version of the engine (4.21.2-4753647)

Steps to Reproduce
  1. Open the editor
  2. Create a new actor blueprint
  3. Add a component to the blueprint (static mesh was used in this example (should end up being default scene root > static mesh))
  4. Select both components
  5. Press ctrl+W or right click > duplicate

Result: The editor crashes
Expected: The selected components would be duplicated

Callstack
Assertion failed: !DeferredOngoingCreateTransaction.IsValid() [File:E:\UE4DevMainStream\Engine\Source\Editor\Kismet\Private\SSCSEditor.cpp] [Line: 5120]

UE4Editor_Core!FWindowsErrorOutputDevice::Serialize() [e:\ue4devmainstream\engine\source\runtime\core\private\windows\windowserroroutputdevice.cpp:79]
UE4Editor_Core!FOutputDevice::LogfImpl() [e:\ue4devmainstream\engine\source\runtime\core\private\misc\outputdevice.cpp:71]
UE4Editor_Core!FDebug::AssertFailed() [e:\ue4devmainstream\engine\source\runtime\core\private\misc\assertionmacros.cpp:446]
UE4Editor_Core!FDebug::CheckVerifyFailedImpl() [e:\ue4devmainstream\engine\source\runtime\core\private\misc\assertionmacros.cpp:424]
UE4Editor_Kismet!SSCSEditor::AddNewComponent() [e:\ue4devmainstream\engine\source\editor\kismet\private\sscseditor.cpp:5120]
UE4Editor_Kismet!SSCSEditor::OnDuplicateComponent() [e:\ue4devmainstream\engine\source\editor\kismet\private\sscseditor.cpp:4099]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,SSCSEditor,0,void __cdecl(void)>::ExecuteIfSafe() [e:\ue4devmainstream\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:355]
UE4Editor_Slate!FUICommandList::ExecuteAction() [e:\ue4devmainstream\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:99]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [e:\ue4devmainstream\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1021]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [e:\ue4devmainstream\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:981]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void)>::Execute() [e:\ue4devmainstream\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:279]
UE4Editor_Slate!SButton::OnMouseButtonUp() [e:\ue4devmainstream\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:294]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [e:\ue4devmainstream\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:385]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_6c1f6b862bcfb82ea6dcab28fbcc9463> >() [e:\ue4devmainstream\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:271]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [e:\ue4devmainstream\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5597]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [e:\ue4devmainstream\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6202]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [e:\ue4devmainstream\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6175]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [e:\ue4devmainstream\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1843]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [e:\ue4devmainstream\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2295]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [e:\ue4devmainstream\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1523]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [e:\ue4devmainstream\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:773]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [e:\ue4devmainstream\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:130]
UE4Editor!FEngineLoop::Tick() [e:\ue4devmainstream\engine\source\runtime\launch\private\launchengineloop.cpp:3954]
UE4Editor!GuardedMain() [e:\ue4devmainstream\engine\source\runtime\launch\private\launch.cpp:173]
UE4Editor!GuardedMainWrapper() [e:\ue4devmainstream\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
UE4Editor!WinMain() [e:\ue4devmainstream\engine\source\runtime\launch\private\windows\launchwindows.cpp:275]
UE4Editor!__scrt_common_main_seh() [d:\agent\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

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Fixed
ComponentGameplay - Blueprint
Affects Versions4.224.23
Target Fix4.22.1
Fix Commit5790810
Main Commit5813358
CreatedApr 4, 2019
ResolvedApr 9, 2019
UpdatedApr 24, 2019