diff --git a/api/services/dataset_service.py b/api/services/dataset_service.py
index e7af975009..d5a54ba731 100644
--- a/api/services/dataset_service.py
+++ b/api/services/dataset_service.py
@@ -845,7 +845,7 @@ class DocumentService:
                         'only_main_content': website_info.get('only_main_content', False),
                         'mode': 'crawl',
                     }
-                    if url.length > 255:
+                    if len(url) > 255:
                         document_name = url[:200] + '...'
                     else:
                         document_name = url