[Admin Radar] Error @Sleeper (Text): System.NullReferenceException: Object reference not set to an instance of an object
  at Oxide.Plugins.AdminRadar+Radar.ShowSleepers () [0x00020] in <1ef00b07512d4d6e871712925f0eab3b>:0

ok, should be fixed in 5.4.0

thank you nivex