diff --git a/app/scodoc/sco_formsemestre_status.py b/app/scodoc/sco_formsemestre_status.py
index 4b5216c4..76b135c3 100644
--- a/app/scodoc/sco_formsemestre_status.py
+++ b/app/scodoc/sco_formsemestre_status.py
@@ -1361,7 +1361,7 @@ def get_formsemestre_etudids_sans_notes(
         .count()
     )
     if not nb_notes_sem:
-        return
+        return set()
     etudids_sans_notes = set.intersection(
         *[
             set.intersection(*m_res.evals_etudids_sans_note.values())