Serializing NetworkPlayer

I'm using a code to serialize unity non serializable classes like Vector3.

With Vector3 it worked right but when I use the same code with NetworkPlayer it gives me an error.

Here is the code: using UnityEngine; using System.Collections; using System;

 [Serializable()]
 public class WB_NetworkPlayer {
     
     private string externalIP;
     private int externalPort;
     private string guid;
     private string ipAddress;
     private int port;
     
     public WB_NetworkPlayer() { }
     public WB_NetworkPlayer(NetworkPlayer networkPlayer) {
         externalIP = networkPlayer.externalIP;
         externalPort = networkPlayer.externalPort;
         guid = networkPlayer.guid;
         ipAddress = networkPlayer.ipAddress;
         port = networkPlayer.port;
     }
     
     public static implicit operator WB_NetworkPlayer(NetworkPlayer networkPlayer) {
         return new WB_NetworkPlayer(networkPlayer);
     }
     public static explicit operator NetworkPlayer(WB_NetworkPlayer wb_networkPlayer) {
         return new NetworkPlayer(wb_networkPlayer.ipAddress, wb_networkPlayer.port);
     }
 }

My Error:

 ArgumentException: Internal_GetExternalIP can only be called from the main thread.
 Constructors and field initializers will be executed from the loading thread when loading a scene.