diff --git a/litellm/proxy/guardrails/usage_endpoints.py b/litellm/proxy/guardrails/usage_endpoints.py
index 47239e5014b..e2d26afa549 100644
--- a/litellm/proxy/guardrails/usage_endpoints.py
+++ b/litellm/proxy/guardrails/usage_endpoints.py
@@ -611,7 +611,11 @@ async def guardrails_usage_logs(
             ) or _find_config_loaded_guardrail(guardrail_id)
             if guardrail:
                 logical_name = _get_guardrail_dict_field(guardrail, "guardrail_name")
-                if logical_name and isinstance(logical_name, str) and logical_name not in effective_guardrail_ids:
+                if (
+                    logical_name
+                    and isinstance(logical_name, str)
+                    and logical_name not in effective_guardrail_ids
+                ):
                     effective_guardrail_ids.append(logical_name)
 
         where = _build_usage_logs_where(effective_guardrail_ids or None, policy_id, start_date, end_date)