diff --git a/websocket-sharp/Net/CookieCollection.cs b/websocket-sharp/Net/CookieCollection.cs
index c0eb8248..a48a07d9 100644
--- a/websocket-sharp/Net/CookieCollection.cs
+++ b/websocket-sharp/Net/CookieCollection.cs
@@ -337,7 +337,8 @@ namespace WebSocketSharp.Net
         if (cookie != null)
           ret.add (cookie);
 
-        cookie = new Cookie (name, val);
+        if (!Cookie.TryCreateCookie (name, val, out cookie))
+          continue;
 
         if (ver != 0)
           cookie.Version = ver;