diff --git a/litellm/proxy/managed_agents_endpoints/sessions.py b/litellm/proxy/managed_agents_endpoints/sessions.py
index 9d4f208003b..7befd8b4da0 100644
--- a/litellm/proxy/managed_agents_endpoints/sessions.py
+++ b/litellm/proxy/managed_agents_endpoints/sessions.py
@@ -146,7 +146,7 @@ async def get_session_endpoint(
     row = await get_session(
         prisma_client,
         session_id=session_id,
-        created_by=user_api_key_dict.user_id,
+        created_by=user_api_key_dict.user_id or _DEFAULT_CREATED_BY,
     )
 
     if not row: