Error when using Ping Feature

Hello. So I just saw in the config that there is a ping feature where we can see a players ping. I enabled it and set it to update every 10 seconds. That works just fine. The issue is that when I click on the sleeper radar button via the GUI, the error below is thrown.

[Admin Radar] Error @Sleeper: System.NullReferenceException: Object reference not set to an instance of an object
  at Facepunch.Network.Raknet.Server.GetAveragePing (Network.Connection connection) [0x0000a] in <75104be9e91c4aee996a02835387fb94>:0 
  at Oxide.Game.Rust.Libraries.Player.Ping (Network.Connection connection) [0x00000] in <360cfef5639e4806a7641c596f210446>:0 
  at Oxide.Game.Rust.Libraries.Player.Ping (BasePlayer player) [0x0000c] in <360cfef5639e4806a7641c596f210446>:0 
  at Oxide.Game.Rust.Libraries.Covalence.RustPlayer.get_Ping () [0x00010] in <360cfef5639e4806a7641c596f210446>:0 
  at Oxide.Plugins.AdminRadar+Radar.DrawAppendedText (BasePlayer target, UnityEngine.Vector3 a, UnityEngine.Vector3 offset, UnityEngine.Color color) [0x00163] in <ee59a831145346df9b0880379f3f2cfc>:0 
  at Oxide.Plugins.AdminRadar+Radar+<>c__DisplayClass97_0.<TryCacheSleepingPlayer>b__0 () [0x0016d] in <ee59a831145346df9b0880379f3f2cfc>:0 
  at Oxide.Plugins.AdminRadar+Radar.DirectDrawAll () [0x0010e] in <ee59a831145346df9b0880379f3f2cfc>:0

ok, thank you