Lighting build fails with EXCEPTION_ACCESS_VIOLATION if I move a static mesh too close to a structure?

Development Rendering
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I’m just doing basic level construction with a bunch of free store assets, nothing special going on yet really. However, if I move this one piece too close to this other structure, the lighting build starts failing.

This works:

2560×1402 601 KB

This breaks:

2560×1402 694 KB

I’m only moving the thing like 3 feet over!

The only thing that might be related is the build fails when it stops saying (1 unbuilt object) and starts saying 3 unbuilt objects) as I get it closer.

The full error text is:

=== Lightmass crashed: ===Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff
Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Programs/UnrealLightmass/Private/Lighting/LightingSystem.cpp] [Line: 1458] 
Static lighting thread exception:
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff

0x00007ffc7f5e85a2 embree.dll!UnknownFunction []
0x00007ffc7f1195f0 embree.dll!UnknownFunction []
0x00007ff6c587b9cf UnrealLightmass.exe!Lightmass::FEmbreeAggregateMesh::IntersectLightRay() []
0x00007ff6c585c35a UnrealLightmass.exe!Lightmass::FStaticLightingSystem::CachePointIncomingRadiance() []
0x00007ff6c590020e UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ProcessCacheIndirectLightingTask() []
0x00007ff6c58f4b0d UnrealLightmass.exe!Lightmass::FStaticLightingSystem::CalculateIndirectLightingTextureMapping() []
0x00007ff6c5902da3 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ProcessTextureMapping() []
0x00007ff6c58e8eb4 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ThreadLoop() []
0x00007ff6c58e41b3 UnrealLightmass.exe!Lightmass::FMappingProcessingThreadRunnable::Run() []
0x00007ffc7e4dd547 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ffc7e4d67c0 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ffd4c847034 KERNEL32.DLL!UnknownFunction []
0x00007ffd4cee2651 ntdll.dll!UnknownFunction []

0x00007ff6c58d8966 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::MultithreadProcess() []
0x00007ff6c58a7c04 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::FStaticLightingSystem() []
0x00007ff6c585a339 UnrealLightmass.exe!Lightmass::BuildStaticLighting() []
0x00007ff6c5880d57 UnrealLightmass.exe!Lightmass::LightmassMain() []
0x00007ff6c589fdc3 UnrealLightmass.exe!main() []
0x00007ff6c59088b4 UnrealLightmass.exe!__scrt_common_main_seh() []
0x00007ffd4c847034 KERNEL32.DLL!UnknownFunction []
0x00007ffd4cee2651 ntdll.dll!UnknownFunction []