Its crashing only when someones is joins the lobby. Custom event “Update” is called from the gamemode event OnPostLogin.
Crash log says this: Assertion failed: ArrayNum < ShadowArrayNum || SharedParams.Cmds[CmdIndex + 1].Type == ERepLayoutCmdType::DynamicArray [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Engine/Private/RepLayout.cpp] [Line: 1585]