diff --git a/backend/app/services/membership_service.py b/backend/app/services/membership_service.py
index f2e8807..6ef1dc4 100644
--- a/backend/app/services/membership_service.py
+++ b/backend/app/services/membership_service.py
@@ -109,7 +109,7 @@ async def list_org_members(
                 "as": "user_doc",
             }
         },
-        {"$unwind": {"path": "$user_doc", "preserveNullAndEmpty": False}},
+        {"$unwind": {"path": "$user_doc", "preserveNullAndEmptyArrays": False}},
         {"$sort": {"created_at": 1}},
     ]
     details = []