diff --git a/app/scodoc/sco_debouche.py b/app/scodoc/sco_debouche.py
index 3f83ba75c..09ae1f5a5 100644
--- a/app/scodoc/sco_debouche.py
+++ b/app/scodoc/sco_debouche.py
@@ -37,7 +37,7 @@ from app.comp.res_compat import NotesTableCompat
 from app.models import FormSemestre
 import app.scodoc.sco_utils as scu
 import app.scodoc.notesdb as ndb
-from app.scodoc.sco_exceptions import AccessDenied
+from app.scodoc.sco_exceptions import AccessDenied, ScoValueError
 from app.scodoc.scolog import logdb
 from app.scodoc.gen_tables import GenTable
 from app.scodoc import safehtml
@@ -259,7 +259,7 @@ def itemsuivi_get(cnx, itemsuivi_id, ignore_errors=False):
     if items:
         return items[0]
     elif not ignore_errors:
-        raise ValueError("invalid itemsuivi_id")
+        raise ScoValueError(f"Débouché: item inexistant ({itemsuivi_id})")
     return None