diff --git a/app/scodoc/sco_import_etuds.py b/app/scodoc/sco_import_etuds.py
index 9f3ed647..b717f2d1 100644
--- a/app/scodoc/sco_import_etuds.py
+++ b/app/scodoc/sco_import_etuds.py
@@ -550,9 +550,9 @@ def _import_one_student(
         formsemestre_id = values["codesemestre"]
     try:
         formsemestre_id = int(formsemestre_id)
-    except ValueError as exc:
+    except (ValueError, TypeError) as exc:
         raise ScoValueError(
-            f"valeur invalide dans la colonne codesemestre, ligne {linenum+1}"
+            f"valeur invalide ou manquante dans la colonne codesemestre, ligne {linenum+1}"
         ) from exc
     # recupere liste des groupes:
     if formsemestre_id not in GroupIdInferers: