Description

This crash only occurs when the asset is dragged and dropped into the level.

Workaround
Add the asset to the level, then to the sequence.

NOTE
This does not occur in //UE4/Main

Steps to Reproduce
  1. Open QAGame
  2. Create a Level Sequence
  3. locate SK_Mannequin in the content browser (Content/Character/UE4_Guy/Mesh)
  4. Drag and drop SK_Mannequin into the level sequence

Result: The engine crashes

Expected Result: SK_Mannequin is added to the Level sequence and the viewport

Callstack
UE4Editor_MovieScene!FUObjectAnnotationSparse<FIsSpawnable,1>::AddAnnotation() uobjectannotation.h:80 
UE4Editor_MovieScene!UMovieScene::AddSpawnable() moviescene.cpp:96 
UE4Editor_Sequencer!FSequencer::AddSpawnable() sequencer.cpp:2985 
UE4Editor_Sequencer!FSequencer::MakeNewSpawnable() sequencer.cpp:2999 
UE4Editor_Sequencer!SSequencer::OnAssetsDropped() ssequencer.cpp:1567 
UE4Editor_Sequencer!SSequencer::OnDrop() ssequencer.cpp:1469 
UE4Editor_Slate!<lambda_6fe3fac4210ea4fdbbd9f162046616f6>::operator() slateapplication.cpp:5040 
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_6fe3fac4210ea4fdbbd9f162046616f6> >() slateapplication.cpp:239 
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() slateapplication.cpp:5036 
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() slateapplication.cpp:5469 
UE4Editor_Slate!FSlateApplication::OnMouseUp() slateapplication.cpp:5446 
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1698 
UE4Editor_Core!FWindowsApplication::DeferMessage() windowsapplication.cpp:2120 
UE4Editor_Core!FWindowsApplication::ProcessMessage() windowsapplication.cpp:867 
UE4Editor_Core!FWindowsApplication::AppWndProc() windowsapplication.cpp:714 
user32!<Unknown> 
user32!<Unknown> 
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() windowsplatformmisc.cpp:980 
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:3008 
UE4Editor!GuardedMain() launch.cpp:166 
UE4Editor!GuardedMainWrapper() launchwindows.cpp:134 
UE4Editor!WinMain() launchwindows.cpp:210 
UE4Editor!__scrt_common_main_seh() exe_common.inl:253 
kernel32!<Unknown> 
ntdll!<Unknown> 

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Fixed
ComponentOLD - Anim
Affects Versions4.16
Target Fix4.16
Fix Commit3312046
Main Commit3362661
CreatedFeb 20, 2017
ResolvedFeb 20, 2017
UpdatedApr 27, 2018
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