diff --git a/ee/api/chalicelib/core/sessions_exp.py b/ee/api/chalicelib/core/sessions_exp.py
index 38c25448d..a4713e992 100644
--- a/ee/api/chalicelib/core/sessions_exp.py
+++ b/ee/api/chalicelib/core/sessions_exp.py
@@ -82,7 +82,7 @@ def get_by_id2_pg(project_id, session_id, context: schemas_ee.CurrentContext, fu
                 (SELECT project_key FROM public.projects WHERE project_id = %(project_id)s LIMIT 1) AS project_key,
                 encode(file_key,'hex') AS file_key
                 {"," if len(extra_query) > 0 else ""}{",".join(extra_query)}
-                {(",json_build_object(" + ",".join([f"'{m}',p.{m}" for m in metadata._get_column_names()]) + ") AS project_metadata") if group_metadata else ''}
+                {(",json_build_object(" + ",".join([f"'{m}',p.{m}" for m in metadata.column_names()]) + ") AS project_metadata") if group_metadata else ''}
             FROM public.sessions AS s {"INNER JOIN public.projects AS p USING (project_id)" if group_metadata else ""}
             WHERE s.project_id = %(project_id)s
                 AND s.session_id = %(session_id)s;""",