Why UE4 crash when listen

Hi
when i start hosting unreal crash everytime
this problem didn’t appear a few days ago when I didn’t modify anything in the blueprints
Crash reports says

Unhandled exception

UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_OnlineSubsystemUtils
UE4Editor_OnlineSubsystemUtils
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll

Hard to say without exact error trace but from string you provided it looks like you are using some editor functionality in Server/Standalone build. That would not work. You can’t link against editor code in this builds. If you are using some plugins they might be causing this problems. Double check that you can build your target configuration with them.