diff --git a/app/scodoc/sco_formsemestre_validation.py b/app/scodoc/sco_formsemestre_validation.py
index e98f2ed4..00d80655 100644
--- a/app/scodoc/sco_formsemestre_validation.py
+++ b/app/scodoc/sco_formsemestre_validation.py
@@ -70,9 +70,9 @@ def formsemestre_validation_etud_form(
         formsemestre_id
     )  # > get_table_moyennes_triees, get_etud_decision_sem
     T = nt.get_table_moyennes_triees()
-    if not etudid and not etud_index:
+    if not etudid and etud_index is None:
         raise ValueError("formsemestre_validation_etud_form: missing argument etudid")
-    if etud_index:
+    if etud_index is not None:
         etud_index = int(etud_index)
         # cherche l'etudid correspondant
         if etud_index < 0 or etud_index >= len(T):