diff --git a/mail/mail_reader_all_contacts.py b/mail/mail_reader_all_contacts.py
index 137ac01..adead85 100755
--- a/mail/mail_reader_all_contacts.py
+++ b/mail/mail_reader_all_contacts.py
@@ -231,31 +231,32 @@ def need_to_check_email(mail: str, successful_items) -> bool:
 
 def find_links_to_validate_from_mail_list(mail_list: list, logger):
     # check time before start checking emails
-    contact_to_book_list = MONGO_STORE_MANAGER.get_all_contact_to_book_list()
-    successful_items = MONGO_STORE_MANAGER.get_all_successful_items_for_day()
-    mails_messages = []
-    with ThreadPoolExecutor(max_workers=len(mail_list)) as executor:
-        for mail in mail_list:
-            # check whether we need to read mail
-            if need_to_check_email(mail.mail, successful_items):
-                mail_reader = MailReader(mail.mail, mail.password)
-                executor.submit(mail_reader.read_emails, mails_messages)
-    # for mail in mail_list:
-    #     # check whether we need to read mail
-    #     if need_to_check_email(mail.mail, successful_items):
-    #         mail_reader = MailReader(mail.mail, mail.password)
-    #         mail_reader.read_emails(mails_messages)
-    _refreshed_successful_items = MONGO_STORE_MANAGER.get_all_successful_items_for_day()
-    for mail in mails_messages:
-        match = re.search(VALIDATION_URL_REGEX, mail.body)
-        if match:
-            url = match.group(0)
-            if need_to_valid_url(url, _refreshed_successful_items):
-                logger.info("need to validate url: " + url)
-                MONGO_STORE_MANAGER.save_links_to_validate(url, mail.to_address,
-                                                           _all_contact_list=contact_to_book_list)
-            else:
-                logger.info("do not need to click url --> {}".format(mail.mail_address))
+    if len(mail_list) > 0:
+        contact_to_book_list = MONGO_STORE_MANAGER.get_all_contact_to_book_list()
+        successful_items = MONGO_STORE_MANAGER.get_all_successful_items_for_day()
+        mails_messages = []
+        with ThreadPoolExecutor(max_workers=len(mail_list)) as executor:
+            for mail in mail_list:
+                # check whether we need to read mail
+                if need_to_check_email(mail.mail, successful_items):
+                    mail_reader = MailReader(mail.mail, mail.password)
+                    executor.submit(mail_reader.read_emails, mails_messages)
+        # for mail in mail_list:
+        #     # check whether we need to read mail
+        #     if need_to_check_email(mail.mail, successful_items):
+        #         mail_reader = MailReader(mail.mail, mail.password)
+        #         mail_reader.read_emails(mails_messages)
+        _refreshed_successful_items = MONGO_STORE_MANAGER.get_all_successful_items_for_day()
+        for mail in mails_messages:
+            match = re.search(VALIDATION_URL_REGEX, mail.body)
+            if match:
+                url = match.group(0)
+                if need_to_valid_url(url, _refreshed_successful_items):
+                    logger.info("need to validate url: " + url)
+                    MONGO_STORE_MANAGER.save_links_to_validate(url, mail.to_address,
+                                                               _all_contact_list=contact_to_book_list)
+                else:
+                    logger.info("do not need to click url --> {}".format(mail.mail_address))
 
 
 if __name__ == '__main__':