Error when building lighting "Array index out of bounds: 1470 from an array of size 1458"

Development Rendering
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1

Confused at what I’ve done as my game has barely changed since last light build and I deleted everything new i added but still I build lighting I get this error message;

 === Lightmass crashed: ===
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 674] 
Array index out of bounds: 1470 from an array of size 1458
0x00007fff8cde7c17 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ff697719dd8 UnrealLightmass.exe!DispatchCheckVerify >() []
0x00007ff69765ca2c UnrealLightmass.exe!Lightmass::FEmbreeGeometry::FEmbreeGeometry() []
0x00007ff697665fbb UnrealLightmass.exe!Lightmass::FEmbreeAggregateMesh::AddMesh() []
0x00007ff6976b67b5 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::FStaticLightingSystem() []
0x00007ff69766a529 UnrealLightmass.exe!Lightmass::BuildStaticLighting() []
0x00007ff6976910d7 UnrealLightmass.exe!Lightmass::LightmassMain() []
0x00007ff6976af8d3 UnrealLightmass.exe!main() []
0x00007ff697716c64 UnrealLightmass.exe!__scrt_common_main_seh() []
0x00007ff80d147034 KERNEL32.DLL!UnknownFunction []
0x00007ff80eafcec1 ntdll.dll!UnknownFunction []



0x00007ff80c3e3e49 KERNELBASE.dll!UnknownFunction []
0x00007fff8d023276 UnrealLightmass-Core.dll!UnknownFunction []
0x00007fff8d026657 UnrealLightmass-Core.dll!UnknownFunction []
0x00007fff8ce53aed UnrealLightmass-Core.dll!UnknownFunction []
0x00007fff8cde58f5 UnrealLightmass-Core.dll!UnknownFunction []
0x00007fff8cde7c50 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ff697719dd8 UnrealLightmass.exe!DispatchCheckVerify >() []
0x00007ff69765ca2c UnrealLightmass.exe!Lightmass::FEmbreeGeometry::FEmbreeGeometry() []
0x00007ff697665fbb UnrealLightmass.exe!Lightmass::FEmbreeAggregateMesh::AddMesh() []
0x00007ff6976b67b5 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::FStaticLightingSystem() []
0x00007ff69766a529 UnrealLightmass.exe!Lightmass::BuildStaticLighting() []
0x00007ff6976910d7 UnrealLightmass.exe!Lightmass::LightmassMain() []
0x00007ff6976af8d3 UnrealLightmass.exe!main() []
0x00007ff697716c64 UnrealLightmass.exe!__scrt_common_main_seh() []
0x00007ff80d147034 KERNEL32.DLL!UnknownFunction []
0x00007ff80eafcec1 ntdll.dll!UnknownFunction []
2

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