diff --git a/backend/app/services/membership_service.py b/backend/app/services/membership_service.py
index 8376184..f2e8807 100644
--- a/backend/app/services/membership_service.py
+++ b/backend/app/services/membership_service.py
@@ -124,8 +124,8 @@ async def list_org_members(
             MemberDetail(
                 membership_id=str(doc["_id"]),
                 user_id=doc.get("user_id", ""),
-                email=u.get("email", ""),
-                full_name=u.get("full_name", ""),
+                email=u.get("email") or "",
+                full_name=u.get("full_name") or "",
                 role_in_org=role,
                 created_at=doc.get("created_at"),
             )