Got 100% crash on cooking game. We don’t use landscape grass. Anybody got idea where to look for solution? 
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: === Critical error: ===
PackagingResults: Error: begin: stack for UAT
PackagingResults: Error: === Critical error: ===
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: Fatal error!
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000008
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba671c141 UE4Editor-Landscape.dll!ALandscapeProxy::FlushGrassComponents() [d:\build\++ue4\sync\engine\source\runtime\landscape\private\landscapegrass.cpp:1946]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba6697263 UE4Editor-Landscape.dll!ALandscapeProxy::RecreateCollisionComponents() [d:\build\++ue4\sync\engine\source\runtime\landscape\private\landscapeedit.cpp:3491]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba6691aa2 UE4Editor-Landscape.dll!ALandscapeProxy::PostLoad() [d:\build\++ue4\sync\engine\source\runtime\landscape\private\landscape.cpp:1651]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba66918a4 UE4Editor-Landscape.dll!ALandscape::PostLoad() [d:\build\++ue4\sync\engine\source\runtime\landscape\private\landscape.cpp:1276]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba6b92e05 UE4Editor-CoreUObject.dll!UObject::ConditionalPostLoad() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:1011]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba6c7b241 UE4Editor-CoreUObject.dll!EndLoad() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1630]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba6c95d64 UE4Editor-CoreUObject.dll!LoadPackageInternal() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1375]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba6c94f59 UE4Editor-CoreUObject.dll!LoadPackage() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1471]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba25e379f UE4Editor-Engine.dll!UWorld::LoadSecondaryLevels() [d:\build\++ue4\sync\engine\source\runtime\engine\private\levelactor.cpp:1181]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba012dbf2 UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::PostLoadPackageFixup() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2480]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba00fb8b8 UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::GetAllUnsolicitedPackages() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2096]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffba01563db UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::TickCookOnTheSide() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:1778]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffb9ffc7a8d UE4Editor-UnrealEd.dll!UCookCommandlet::CookByTheBook() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:914]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffb9fff88ff UE4Editor-UnrealEd.dll!UCookCommandlet::Main() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:585]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff76f39e9c2 UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2322]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff76f395968 UE4Editor-Cmd.exe!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:127]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff76f395bba UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:144]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff76f3a3dac UE4Editor-Cmd.exe!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:223]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff76f3a4ce6 UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffbef523034 KERNEL32.DLL!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffbf0ab1431 ntdll.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: end: stack for UAT
It could be the same or similar thing to 110% crash on cooking in 4.19 (callstack was different).
https://answers.unrealengine.com/questions/806479/packaging-fails-on-shader-how-to-debug-it.html