diff --git a/Manager.YouTube/YouTubeClient.cs b/Manager.YouTube/YouTubeClient.cs
index 8252a83..7038b30 100644
--- a/Manager.YouTube/YouTubeClient.cs
+++ b/Manager.YouTube/YouTubeClient.cs
@@ -21,30 +21,33 @@ public sealed class YouTubeClient : IDisposable
     public Cookie? SapisidCookie => CookieContainer.GetAllCookies()["SAPISID"];
     public HttpClient HttpClient { get; }
     
-    private YouTubeClient(CookieCollection cookies, string userAgent)
+    private YouTubeClient(CookieCollection? cookies, string userAgent)
     {
         if (string.IsNullOrWhiteSpace(userAgent))
         {
             throw new ArgumentNullException(nameof(userAgent));
         }
         UserAgent = userAgent;
-        if (cookies.Count == 0)
+        if (cookies == null || cookies.Count == 0)
         {
             Id = $"anon_{Guid.NewGuid()}";
             IsAnonymous = true;
         }
-
-        CookieContainer.Add(cookies);
+        else
+        {
+            CookieContainer.Add(cookies);
+        }
+        
         HttpClient = new HttpClient(GetHttpClientHandler());
     }
 
     /// <summary>
     /// Loads the given cookies and fetch client state.
     /// </summary>
-    /// <param name="cookies">The cookies to use for making requests. Empty collection for anonymous requests.</param>
+    /// <param name="cookies">The cookies to use for making requests. Empty collection or null for anonymous requests.</param>
     /// <param name="userAgent">The user agent to use for the requests. Only WEB client is supported.</param>
     /// <returns></returns>
-    public static async Task<Result<YouTubeClient>> CreateAsync(CookieCollection cookies, string userAgent)
+    public static async Task<Result<YouTubeClient>> CreateAsync(CookieCollection? cookies, string userAgent)
     {
         var client = new YouTubeClient(cookies, userAgent);
         var clientInitializeResult = await client.FetchClientDataAsync();