diff --git a/backend/open_webui/routers/configs.py b/backend/open_webui/routers/configs.py
index 46fbb41b99..10577e26d6 100644
--- a/backend/open_webui/routers/configs.py
+++ b/backend/open_webui/routers/configs.py
@@ -234,7 +234,7 @@ async def verify_tool_servers_config(
                                     )
                                     raise HTTPException(
                                         status_code=400,
-                                        detail=f"Failed to parse OAuth 2.1 discovery document from {discovery_urls[0]}",
+                                        detail=f"Failed to parse OAuth 2.1 discovery document from {discovery_url}",
                                     )
 
                 raise HTTPException(