Build light lightmass crash when Load ICU DLL

Hi

It reported crash (but Editor still working) when building light try to load some ICUInternationalization DLL, the build light process stopped.

I guess the InverseFast() throw some error message, ICU DLL try to translate that message but fail to find proper dll for my region/language.

I tried to change my Windows8.1 to pure English region/language, but no help.

=== Lightmass crashed: ===
Assertion failed: DllHandle != nullptr [File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Core\Private\Internationalization\ICUInternationalization.cpp][Line:238]

I have this same issue. Please let me know if you resolved it.

My workaround is not to solve the issue, but try to locate the scene level which arise the crash, and remove the scene level or actor.