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:
diff --git a/app/scodoc/sco_liste_notes.py b/app/scodoc/sco_liste_notes.py
index 7452021f..00e61589 100644
--- a/app/scodoc/sco_liste_notes.py
+++ b/app/scodoc/sco_liste_notes.py
@@ -201,6 +201,7 @@ def do_evaluation_listenotes(
         note_sur_20 = tf[2]["note_sur_20"]
         hide_groups = tf[2]["hide_groups"]
         with_emails = tf[2]["with_emails"]
+        group_ids = [x for x in tf[2]["group_ids"] if x != ""]
         return (
             _make_table_notes(
                 tf[1],
@@ -208,7 +209,7 @@ def do_evaluation_listenotes(
                 format=format,
                 note_sur_20=note_sur_20,
                 anonymous_listing=anonymous_listing,
-                group_ids=tf[2]["group_ids"],
+                group_ids=group_ids,
                 hide_groups=hide_groups,
                 with_emails=with_emails,
                 mode=mode,