Steps to Reproduce
  1. Open a map
  2. Enable HLOD in the world settings
  3. Open the HLOD outliner
  4. Drag a static mesh from the world outliner into the HLOD cluster area
    Result
    Crash
Callstack

Fatal error!

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000048

UE4Editor-Engine.dll!ALODActor::SetStaticMesh() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\lodactor.cpp:624]
UE4Editor-HierarchicalLODUtilities.dll!FHierarchicalLODUtilities::CreateNewClusterActor() [d:\build\++ue4+release-4.17+compile\sync\engine\source\developer\hierarchicallodutilities\private\hierarchicallodutilities.cpp:421]
UE4Editor-HierarchicalLODUtilities.dll!FHierarchicalLODUtilities::CreateNewClusterFromActors() [d:\build\++ue4+release-4.17+compile\sync\engine\source\developer\hierarchicallodutilities\private\hierarchicallodutilities.cpp:437]
UE4Editor-HierarchicalLODOutliner.dll!HLODOutliner::FLODLevelDropTarget::CreateNewCluster() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\hierarchicallodoutliner\private\lodlevelitem.cpp:169]
UE4Editor-HierarchicalLODOutliner.dll!HLODOutliner::FLODLevelItem::OnDrop() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\hierarchicallodoutliner\private\lodlevelitem.cpp:53]
UE4Editor-HierarchicalLODOutliner.dll!HLODOutliner::HandleDrop() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\hierarchicallodoutliner\private\hlodtreewidgetitem.cpp:95]
UE4Editor-HierarchicalLODOutliner.dll!HLODOutliner::SHLODWidgetItem::OnDrop() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\hierarchicallodoutliner\private\hlodtreewidgetitem.cpp:244]
UE4Editor-Slate.dll!<lambda_74ecb22bb70e3f50c9d83154dfa5c688>::operator()() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5240]
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_74ecb22bb70e3f50c9d83154dfa5c688> >() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:232]
UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5236]
UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5690]
UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5670]
UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1718]
UE4Editor-Core.dll!FWindowsApplication::DeferMessage() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:2161]
UE4Editor-Core.dll!FWindowsApplication::ProcessMessage() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:881]
UE4Editor-Core.dll!FWindowsApplication::AppWndProc() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:721]
USER32.dll!0x00000000E83E1C24
USER32.dll!0x00000000E83E156C
UE4Editor-Core.dll!FWindowsPlatformMisc::PumpMessages() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:1009]
UE4Editor.exe!FEngineLoop::Tick() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3151]
UE4Editor.exe!GuardedMain() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor.exe!WinMain() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
KERNEL32.DLL!0x00000000E5BE8364
ntdll.dll!0x00000000E85A70D1
ntdll.dll!0x00000000E85A70D1

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Fixed
ComponentTools - HLOD
Affects Versions4.17.1
Target Fix4.17.1
Fix Commit3580610
CreatedAug 10, 2017
ResolvedAug 10, 2017
UpdatedApr 27, 2018