Editor is crashing when setting closed loop in the construction script of a blueprint.
This did not occur in 4.12.5 following the same repro, this is a regression.
Result: Editor Crashes
Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 833] Array index out of bounds: -1 from an array of size 0
UE4Editor_Engine!USplineComponent::UpdateSpline() splinecomponent.cpp:157 UE4Editor_Engine!USplineComponent::execSetClosedLoop() splinecomponent.h:128 UE4Editor_CoreUObject!UFunction::Invoke() class.cpp:4280 UE4Editor_CoreUObject!UObject::CallFunction() scriptcore.cpp:697 UE4Editor_CoreUObject!UObject::ProcessContextOpcode() scriptcore.cpp:2126 UE4Editor_CoreUObject!UObject::ProcessInternal() scriptcore.cpp:922 UE4Editor_CoreUObject!UFunction::Invoke() class.cpp:4280 UE4Editor_CoreUObject!UObject::ProcessEvent() scriptcore.cpp:1305 UE4Editor_Engine!AActor::ProcessEvent() actor.cpp:652 UE4Editor_Engine!AActor::ProcessUserConstructionScript() actorconstruction.cpp:768 UE4Editor_Engine!AActor::ExecuteConstruction() actorconstruction.cpp:690 UE4Editor_UnrealEd!FActorReplacementHelper::Finalize() kismetreinstanceutilities.cpp:992 UE4Editor_UnrealEd!FBlueprintCompileReinstancer::ReplaceInstancesOfClass_Inner() kismetreinstanceutilities.cpp:1724 UE4Editor_UnrealEd!FBlueprintCompileReinstancer::ReplaceInstancesOfClass() kismetreinstanceutilities.cpp:1314 UE4Editor_UnrealEd!FBlueprintCompileReinstancer::ReinstanceInner() kismetreinstanceutilities.cpp:608 UE4Editor_UnrealEd!FBlueprintCompileReinstancer::ReinstanceObjects() kismetreinstanceutilities.cpp:770 UE4Editor_UnrealEd!FKismetEditorUtilities::CompileBlueprint() kismet2.cpp:795 UE4Editor_Kismet!FBlueprintEditor::Compile() blueprinteditor.cpp:3216 UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl() delegateinstancesimpl.h:317 UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl() delegateinstancesimpl.h:424 UE4Editor_Slate!FUICommandList::ExecuteAction() uicommandlist.cpp:92 UE4Editor_Slate!SToolBarButtonBlock::OnClicked() stoolbarbuttonblock.cpp:300 UE4Editor_Slate!TMemberFunctionCaller<SToolBarButtonBlock,FReply() delegateinstanceinterface.h:161 UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SToolBarButtonBlock,FReply() tuple.h:115 UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl() delegateinstancesimpl.h:317 UE4Editor_Slate!TBaseDelegate<FReply>::Execute() delegatesignatureimpl.inl:521 UE4Editor_Slate!SButton::OnMouseButtonUp() sbutton.cpp:278 UE4Editor_Slate!<lambda_2ba86970cc12b39cc598727b6025bd91>::operator() slateapplication.cpp:4901 UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_2ba86970cc12b39cc598727b6025bd91> >() slateapplication.cpp:215 UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() slateapplication.cpp:4890 UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() slateapplication.cpp:5348 UE4Editor_Slate!FSlateApplication::OnMouseUp() slateapplication.cpp:5328 UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1584 UE4Editor_Core!FWindowsApplication::DeferMessage() windowsapplication.cpp:1930 UE4Editor_Core!FWindowsApplication::ProcessMessage() windowsapplication.cpp:747 UE4Editor_Core!FWindowsApplication::AppWndProc() windowsapplication.cpp:669 user32!<Unknown> user32!<Unknown> UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() windowsplatformmisc.cpp:905 UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2788 UE4Editor!GuardedMain() launch.cpp:156 UE4Editor!GuardedMainWrapper() launchwindows.cpp:126 UE4Editor!WinMain() launchwindows.cpp:202 UE4Editor!__scrt_common_main_seh() exe_common.inl:253 kernel32!<Unknown> ntdll!<Unknown>
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