diff --git a/gpt4free/usesless/__init__.py b/gpt4free/usesless/__init__.py
index 9efc410f..1192192e 100644
--- a/gpt4free/usesless/__init__.py
+++ b/gpt4free/usesless/__init__.py
@@ -53,7 +53,10 @@ class Account:
 
         while True:
             time.sleep(5)
-            message_id = mail_client.message_list()[0]["id"]
+            messages = mail_client.message_list()
+            if not messages or len(messages) == 0:
+                continue
+            message_id = messages[0]["id"]
             message = mail_client.message(message_id)
             verification_url = re.findall(
                 r"http:\/\/ai\.usesless\.com\/api\/cms\/auth\/email-confirmation\?confirmation=\w.+\w\w",