Lightmass crashed when building

Hello,
When building lights I have an error appearing all the time. Can someone possibly help me solving the issue?

=== Lightmass crashed: ===
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\Containers/Array.h] [Line: 610]
Array index out of bounds: 36249 from an array of size 36249

0x000000008ED7A388 KERNELBASE.dll!UnknownFunction []

0x0000000040AE5E24 UnrealLightmass-ApplicationCore.dll!UnknownFunction []

0x000000000690A48B UnrealLightmass-Core.dll!UnknownFunction []

0x000000000684D258 UnrealLightmass-Core.dll!UnknownFunction []

0x00000000F7A1D95C UnrealLightmass.exe!UnknownFunction []

0x00000000F7A27734 UnrealLightmass.exe!UnknownFunction []

0x00000000F7A7F96A UnrealLightmass.exe!UnknownFunction []

0x00000000F7A2DE64 UnrealLightmass.exe!UnknownFunction []

0x00000000F7A56D23 UnrealLightmass.exe!UnknownFunction []

0x00000000F7A75D4A UnrealLightmass.exe!UnknownFunction []

0x00000000F7AF1F35 UnrealLightmass.exe!UnknownFunction []

0x0000000090543034 KERNEL32.DLL!UnknownFunction []

0x0000000092981431 ntdll.dll!UnknownFunction []

0x0000000092981431 ntdll.dll!UnknownFunction []