Crash When Curve Editor is on When Animating Button Transform in Widget Blueprint

In a Widget Blueprint, after animating a button to transform vertically (possibly other directions) with the Curve Editor active, engine will crash upon creating a second animation.

1. In a Blank Project in UE4.10
2. Create a User Interface > Widget Blueprint
3. Drag in a button;
4. Add animation track
5. Click "Show animation keys in curve editor". (The crash only happens when this is active)
6. Using the button you dragged in the window, create an animation where on 0.0 seconds the position Y of button is 0 and on 0.5 seconds, the position Y of button is 150; (See Attached images for Help)
7. Create a second animation
   RESULT: Engine crashes 4/4
   EXPECTED: Second Animation to successfully generate

Unknown exception - code 00000001 (first/second chance not available)
"Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed]
UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\misc\outputdevice.cpp:374] UE4Editor_Sequencer!TArray,FDefaultAllocator>::Last() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\containers\array.h:825] UE4Editor_Sequencer!FSequencer::GetFocusedMovieSceneSequence() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\sequencer\private\sequencer.cpp:292] UE4Editor_Sequencer!FSequencer::OnViewRangeChanged() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\sequencer\private\sequencer.cpp:1221] UE4Editor_Sequencer!TBaseSPMethodDelegateInstance<0,FSequencer,0,TTypeWrapper _cdecl(TRange,enum EViewRangeInterpolation,bool)>::Execute() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:282] UE4Editor_Sequencer!TBaseSPMethodDelegateInstance<0,FSequencer,0,void __cdecl(TRange,enum EViewRangeInterpolation,bool)>::ExecuteIfSafe() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:388] UE4Editor_Sequencer!TBaseDelegate,enum EViewRangeInterpolation,bool>::ExecuteIfBound() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:482] UE4Editor_Sequencer!TBaseFunctorDelegateInstance __cdecl(float,float), >::Execute() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:1008] UE4Editor_UnrealEd!SCurveEditor::ZoomToFitHorizontal() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\unrealed\private\scurveeditor.cpp:2379] UE4Editor_UnrealEd!SCurveEditor::ZoomToFit() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\unrealed\private\scurveeditor.cpp:2482] UE4Editor_Sequencer!SSequencerCurveEditor::NodeTreeSelectionChanged() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\sequencer\private\ssequencercurveeditor.cpp:181] UE4Editor_Sequencer!TBaseSPMethodDelegateInstance<0,SSequencerCurveEditor,0,TTypeWrapper __cdecl(void)>::Execute() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:282] UE4Editor_Sequencer!TBaseSPMethodDelegateInstance<0,SSequencerCurveEditor,0,void __cdecl(void)>::ExecuteIfSafe() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:387] UE4Editor_Sequencer!TBaseMulticastDelegate::Broadcast() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:809] UE4Editor_Sequencer!FSequencerSelection::EmptySelectedOutlinerNodes() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\sequencer\private\sequencerselection.cpp:155] UE4Editor_Sequencer!FSequencer::ResetToNewRootSequence() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\sequencer\private\sequencer.cpp:302] UE4Editor_UMGEditor!FWidgetBlueprintEditor::ChangeViewedAnimation() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\umgeditor\private\widgetblueprinteditor.cpp:594] UE4Editor_UMGEditor!SUMGAnimationList::OnSelectionChanged() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\umgeditor\private\tabfactory\animationtabsummoner.cpp:396] UE4Editor_UMGEditor!TBaseSPMethodDelegateInstance<0,SUMGAnimationList,0,TTypeWrapper __cdecl(TSharedPtr,enum ESelectInfo::Type)>::Execute() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:282] UE4Editor_UMGEditor!TBaseSPMethodDelegateInstance<0,SUMGAnimationList,0,void __cdecl(TSharedPtr,enum ESelectInfo::Type)>::ExecuteIfSafe() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:388] UE4Editor_UMGEditor!TBaseDelegate,enum ESelectInfo::Type>::ExecuteIfBound() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:482] UE4Editor_UMGEditor!SListView >::Private_SignalSelectionChanged() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\slate\public\widgets\views\slistview.h:609] UE4Editor_UMGEditor!STableRow >::OnMouseButtonUp() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\slate\public\widgets\views\stablerow.h:446] UE4Editor_Slate!::operator()() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4276] UE4Editor_Slate!FEventRouter::Route >() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:214] UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4266] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4663] UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4641] UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\windows\windowsapplication.cpp:1416] UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\windows\windowsapplication.cpp:1721] UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\windows\windowsapplication.cpp:719] UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\windows\windowsapplication.cpp:641] user32 user32 UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:884] UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\launchengineloop.cpp:2391] UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\launch.cpp:142] UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\windows\launchwindows.cpp:126] UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\windows\launchwindows.cpp:200] UE4Editor!_scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264] kernel32 ntdll

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