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Lightmass errors

Hello,

Did anybody have a lightmass issue like this?

<None> === Lightmass crashed: ===
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\core\public\Containers/Array.h] [Line: 610]
Array index out of bounds: 28426 from an array of size 28426

0x00000000C3E14008 KERNELBASE.dll!UnknownFunction ]
0x000000002BD05E54 UnrealLightmass-ApplicationCore.dll!UnknownFunction ]
0x000000002AFD1A8B UnrealLightmass-Core.dll!UnknownFunction ]
0x000000002AF62E98 UnrealLightmass-Core.dll!UnknownFunction ]
0x00000000C3E8F056 UnrealLightmass.exe!UnknownFunction ]
0x00000000C3E9E054 UnrealLightmass.exe!UnknownFunction ]
0x00000000C3E93B8B UnrealLightmass.exe!UnknownFunction ]
0x00000000C3EA58A4 UnrealLightmass.exe!UnknownFunction ]
0x00000000C3EDD863 UnrealLightmass.exe!UnknownFunction ]
0x00000000C3F004DA UnrealLightmass.exe!UnknownFunction ]
0x00000000C3F5EC25 UnrealLightmass.exe!UnknownFunction ]
0x00000000C5EC1FE4 KERNEL32.DLL!UnknownFunction ]
0x00000000C6EAEFC1 ntdll.dll!UnknownFunction ]
0x00000000C6EAEFC1 ntdll.dll!UnknownFunction ]

It’s a very simple scene…the only difference is that I used datasmith…

Thanks in advance.