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Callstack
Assertion failed: LandscapeInfo [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Editor\UnrealEd\Private\Lightmass\LightmassLandscapeRender.cpp] [Line: 236]

UE4Editor_UnrealEd!GetLandscapeOpacityData() [lightmasslandscaperender.cpp:238]
UE4Editor_UnrealEd!FLightmassMaterialRenderer::GenerateMaterialPropertyData() [lightmassrender.cpp:1053]
UE4Editor_UnrealEd!FLightmassMaterialRenderer::GenerateMaterialData() [lightmassrender.cpp:963]
UE4Editor_UnrealEd!FLightmassExporter::ExportMaterial() [lightmass.cpp:1284]
UE4Editor_UnrealEd!FLightmassExporter::WriteToMaterialChannel() [lightmass.cpp:728]
UE4Editor_UnrealEd!FLightmassProcessor::ExecuteAmortizedMaterialExport() [lightmass.cpp:2619]
UE4Editor_UnrealEd!FStaticLightingSystem::UpdateLightingBuild() [staticlightingsystem.cpp:2156]
UE4Editor_UnrealEd!FStaticLightingManager::UpdateBuildLighting() [staticlightingsystem.cpp:327]
UE4Editor_UnrealEd!UEditorEngine::UpdateBuildLighting() [staticlightingsystem.cpp:2312]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3296]
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!BaseThreadInitThunk()
ntdll!RtlUserThreadStart()

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Fixed
ComponentUE - Graphics Features
Affects Versions4.174.184.20
Target Fix4.23
CreatedDec 15, 2017
ResolvedMay 31, 2019
UpdatedJul 8, 2019