diff --git a/app/scodoc/sco_formsemestre.py b/app/scodoc/sco_formsemestre.py
index 8d286b22..32c2d9e3 100644
--- a/app/scodoc/sco_formsemestre.py
+++ b/app/scodoc/sco_formsemestre.py
@@ -147,7 +147,12 @@ def _formsemestre_enrich(sem):
     # imports ici pour eviter refs circulaires
     from app.scodoc import sco_formsemestre_edit
 
-    F = sco_formations.formation_list(args={"formation_id": sem["formation_id"]})[0]
+    formations = sco_formations.formation_list(
+        args={"formation_id": sem["formation_id"]}
+    )
+    if not formations:
+        raise ScoValueError("pas de formation pour ce semestre !")
+    F = formations[0]
     parcours = sco_codes_parcours.get_parcours_from_code(F["type_parcours"])
     # 'S1', 'S2', ... ou '' pour les monosemestres
     if sem["semestre_id"] != NO_SEMESTRE_ID: