diff --git a/app/views/notes.py b/app/views/notes.py
index 4bc79eba..4ee25a90 100644
--- a/app/views/notes.py
+++ b/app/views/notes.py
@@ -2339,14 +2339,14 @@ def formsemestre_validation_but(
     formsemestre: FormSemestre = FormSemestre.query.filter_by(
         id=formsemestre_id, dept_id=g.scodoc_dept_id
     ).first_or_404()
-    etud = Identite.get_etud(etudid)
-    nb_etuds = formsemestre.etuds.count()
     # la route ne donne pas le type d'etudid pour pouvoir construire des URLs
     # provisoires avec NEXT et PREV
     try:
         etudid = int(etudid)
-    except ValueError:
-        abort(404, "invalid etudid")
+    except ValueError as exc:
+        raise ScoValueError("adresse invalide") from exc
+    etud = Identite.get_etud(etudid)
+    nb_etuds = formsemestre.etuds.count()
     read_only = not formsemestre.can_edit_jury()
 
     # --- Navigation