Getting this in console

Failed to call hook 'OnPlayerDisconnected' on plugin 'DiscordCallAdmin v1.0.0' (NullReferenceException: Object reference not set to an instance of an object) at Oxide.Plugins.DiscordCallAdmin.StopLiveChat (System.String playerID, System.String reason) [0x00000] in <94bcf5279e9844d7bee543e421978438>:0 at Oxide.Plugins.DiscordCallAdmin.OnPlayerDisconnected (BasePlayer player, System.String reason) [0x0000d] in <94bcf5279e9844d7bee543e421978438>:0 at Oxide.Plugins.DiscordCallAdmin.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x003d4] in <94bcf5279e9844d7bee543e421978438>:0 at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in :0 at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <46ff2b534abb4b35952608167523b7ec>:0 at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <46ff2b534abb4b35952608167523b7ec>:0