diff --git a/backend/app/services/membership_service.py b/backend/app/services/membership_service.py
index fce4b02..8376184 100644
--- a/backend/app/services/membership_service.py
+++ b/backend/app/services/membership_service.py
@@ -13,11 +13,16 @@ def _now() -> datetime:
 
 
 def _membership_from_doc(doc: dict) -> Membership:
+    raw_role = doc.get("role_in_org", "member")
+    try:
+        role = OrgRole(raw_role)
+    except ValueError:
+        role = OrgRole.MEMBER
     return Membership(
         id=str(doc["_id"]),
-        user_id=doc["user_id"],
-        organization_id=doc["organization_id"],
-        role_in_org=OrgRole(doc["role_in_org"]),
+        user_id=doc.get("user_id", ""),
+        organization_id=doc.get("organization_id", ""),
+        role_in_org=role,
         created_at=doc.get("created_at"),
         created_by=doc.get("created_by"),
     )
@@ -110,13 +115,18 @@ async def list_org_members(
     details = []
     async for doc in db.memberships.aggregate(pipeline):
         u = doc["user_doc"]
+        raw_role = doc.get("role_in_org", "member")
+        try:
+            role = OrgRole(raw_role)
+        except ValueError:
+            role = OrgRole.MEMBER
         details.append(
             MemberDetail(
                 membership_id=str(doc["_id"]),
-                user_id=doc["user_id"],
+                user_id=doc.get("user_id", ""),
                 email=u.get("email", ""),
                 full_name=u.get("full_name", ""),
-                role_in_org=OrgRole(doc["role_in_org"]),
+                role_in_org=role,
                 created_at=doc.get("created_at"),
             )
         )