❔ exception for proxy help

private static async Task Check()
        {
            foreach (var cookieList in CookieList)
            {
                var user = JsonReader.readJSON("dataproxy.json", "proxyDetails", "proxyuser");
                var pass = JsonReader.readJSON("dataproxy.json", "proxyDetails", "proxypass");
                var proxyIp = JsonReader.readJSON("dataproxy.json", "proxyDetails", "proxyip");
                var proxyPort = JsonReader.readJSON("dataproxy.json", "proxyDetails", "proxyport");
                var container = new CookieContainer();
                var handler = new HttpClientHandler();
                handler.CookieContainer = container;
                var client = new HttpClient(handler);
                WebProxy proxy = new WebProxy(proxyIp,Convert.ToInt32(proxyPort));
                if(user != null)
                {
                    proxy.Credentials = new NetworkCredential(user, pass);
                }                
                client.BaseAddress = BaseAddress; try
                {
                    handler.Proxy = proxy;
                }
                catch 
                {
                    LogSystem.SendMessage("Proxy Error!", Log.Type.Message);
                }