Swarm chrash EXCEPTION_INT_DIVIDE_BY_ZERO

Hi. I’m having serious problem with baking lighting on big architectural scene.

I have 140gb virtual memory so it’s not Ram… probably.

The scene is combined with dynamic SunSky & Static internal lights.

Meshes are 99% Datasmith from Rhino6.

Here’s the log I get:

Fatal error: [File:/Build/++UE4+Licensee/Sync/Engine/Source/Programs/UnrealLightmass/Private/Lighting/LightingSystem.cpp] [Line: 1458]
Static lighting thread exception:
Unhandled Exception: EXCEPTION_INT_DIVIDE_BY_ZERO

0x00007ff67b7f8172 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::IncomingRadianceAdaptive >() []
0x00007ff67b80c2b6 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::CachePointIncomingRadiance() []
0x00007ff67b8ae9a4 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ProcessCacheIndirectLightingTask() []
0x00007ff67b8a425d UnrealLightmass.exe!Lightmass::FStaticLightingSystem::CalculateIndirectLightingTextureMapping() []
0x00007ff67b8b1341 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ProcessTextureMapping() []
0x00007ff67b8982d4 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ThreadLoop() []
0x00007ff67b8935c3 UnrealLightmass.exe!Lightmass::FMappingProcessingThreadRunnable::Run() []
0x00007ffe754d19f7 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ffe754c9c60 UnrealLightmass-Core.dll!UnknownFunction []
0x00007fff0c3d7bd4 KERNEL32.DLL!UnknownFunction []
0x00007fff0ca6ce51 ntdll.dll!UnknownFunction []

0x00007ff67b8880b6 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::MultithreadProcess() []
0x00007ff67b8575f4 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::FStaticLightingSystem() []
0x00007ff67b80a529 UnrealLightmass.exe!Lightmass::BuildStaticLighting() []
0x00007ff67b8310d7 UnrealLightmass.exe!Lightmass::LightmassMain() []
0x00007ff67b84f8d3 UnrealLightmass.exe!main() []
0x00007ff67b8b6c64 UnrealLightmass.exe!__scrt_common_main_seh() []
0x00007fff0c3d7bd4 KERNEL32.DLL!UnknownFunction []
0x00007fff0ca6ce51 ntdll.dll!UnknownFunction []