2018-05-01 10:35:29.771 - Thread: 1 -> Exception occured: System.ArgumentException: An item with the same key has already been added.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at Equinox.Utils.PlayerCollection.<Refresh>b__14_0(IMyPlayer x)
at Sandbox.Game.Multiplayer.MyPlayerCollection.VRage.Game.ModAPI.IMyPlayerCollection.GetPlayers(List`1 players, Func`2 collect)
at Equinox.Utils.PlayerCollection.Refresh()
at Equinox.Utils.PlayerCollection.<>c__DisplayClass13_0.<PlayerConnected>b__0()
at Sandbox.MySandboxGame.ProcessInvoke()
at Sandbox.MySandboxGame.Update()
at Sandbox.Engine.Platform.Game.UpdateInternal()
at Sandbox.Engine.Platform.Game.RunSingleFrame()
at Sandbox.Engine.Platform.FixedLoop.<>c__DisplayClass1.<Run>b__0()
at Sandbox.Engine.Platform.GenericLoop.Run(VoidAction tickCallback)
at Sandbox.Engine.Platform.Game.RunLoop()
at Sandbox.MySandboxGame.Run(Boolean customRenderLoop, Action disposeSplashScreen)
at SpaceEngineers.MyProgram.Main(String[] args)
SpaceEngineers.log
Unfortunately I can't reproduce it anymore.