diff --git a/app/views/notes.py b/app/views/notes.py
index e66a42f7..8c1ef42d 100644
--- a/app/views/notes.py
+++ b/app/views/notes.py
@@ -292,7 +292,7 @@ def formsemestre_bulletinetud(
     format = format or "html"
 
     if not isinstance(formsemestre_id, int):
-        raise ValueError("formsemestre_id must be an integer !")
+        abort(404)
     formsemestre = FormSemestre.query.get_or_404(formsemestre_id)
     if etudid:
         etud = models.Identite.query.get_or_404(etudid)