diff --git a/antarest/study/repository.py b/antarest/study/repository.py
index d1331941ac..c61a6c7320 100644
--- a/antarest/study/repository.py
+++ b/antarest/study/repository.py
@@ -67,7 +67,7 @@ def build_query_user_from_params(params: t.Union[RequestParameters, JWTUser]) ->
         return QueryUser(
             is_admin=user.is_site_admin() or user.is_admin_token(),
             user_id=user.id,
-            user_groups=user.groups,
+            user_groups=[group.id for group in user.groups],
         )
     else:
         return QueryUser()