diff --git a/app/scodoc/sco_formsemestre_inscriptions.py b/app/scodoc/sco_formsemestre_inscriptions.py
index ec4bb930..03de81db 100644
--- a/app/scodoc/sco_formsemestre_inscriptions.py
+++ b/app/scodoc/sco_formsemestre_inscriptions.py
@@ -288,7 +288,11 @@ def do_formsemestre_inscription_with_modules(
     if isinstance(group_ids, int):
         group_ids = [group_ids]
     # Check that all groups exist before creating the inscription
-    groups = [GroupDescr.query.get_or_404(group_id) for group_id in group_ids]
+    groups = [
+        GroupDescr.query.get_or_404(group_id)
+        for group_id in group_ids
+        if group_id != ""
+    ]
     formsemestre = FormSemestre.get_formsemestre(formsemestre_id, dept_id=dept_id)
     # inscription au semestre
     args = {"formsemestre_id": formsemestre_id, "etudid": etudid}