diff --git a/smtp_connector.py b/smtp_connector.py
index 4bc3af5..6d1d60e 100644
--- a/smtp_connector.py
+++ b/smtp_connector.py
@@ -463,8 +463,10 @@ def _interactive_auth_refresh(self):
         except Exception:
             return phantom.APP_ERROR, "Error retrieving OAuth Token"
 
+        
         self._access_token = oauth_token.get('access_token')
-        self._refresh_token = oauth_token.get('refresh_token')
+        if response_json.get("refresh_token"):
+            self._refresh_token = oauth_token.get('refresh_token')
 
         self._state['oauth_token'] = oauth_token
         return phantom.APP_SUCCESS, ""