diff --git a/gpt4free/usesless/__init__.py b/gpt4free/usesless/__init__.py
index 9efc410f..2295f640 100644
--- a/gpt4free/usesless/__init__.py
+++ b/gpt4free/usesless/__init__.py
@@ -52,7 +52,14 @@ class Account:
             quit()
 
         while True:
-            time.sleep(5)
+            messages = mail_client.message_list()
+            
+            # Check if method `message_list()` didn't return None or empty list.
+            if not messages or len(messages) == 0:
+                # If it returned None or empty list sleep for 5 seconds to wait for new message. 
+                time.sleep(5)
+                continue
+            
             message_id = mail_client.message_list()[0]["id"]
             message = mail_client.message(message_id)
             verification_url = re.findall(