diff --git a/app/scodoc/sco_apogee_csv.py b/app/scodoc/sco_apogee_csv.py
index e7710a910..b1482ec5b 100644
--- a/app/scodoc/sco_apogee_csv.py
+++ b/app/scodoc/sco_apogee_csv.py
@@ -98,7 +98,7 @@ from chardet import detect as chardet_detect
 from app import log
 from app.comp import res_sem
 from app.comp.res_common import NotesTableCompat
-from app.models import FormSemestre
+from app.models import FormSemestre, Identite
 from app.models.config import ScoDocSiteConfig
 import app.scodoc.sco_utils as scu
 from app.scodoc.sco_exceptions import ScoValueError, ScoFormatError
@@ -111,7 +111,6 @@ from app.scodoc.sco_codes_parcours import (
     NAR,
     RAT,
 )
-from app.scodoc import sco_cache
 from app.scodoc import sco_formsemestre
 from app.scodoc import sco_parcours_dut
 from app.scodoc import sco_etud
@@ -454,6 +453,12 @@ class ApoEtud(dict):
 
     def comp_elt_semestre(self, nt, decision, etudid):
         """Calcul résultat apo semestre"""
+        if decision is None:
+            etud = Identite.query.get(etudid)
+            nomprenom = etud.nomprenom if etud else "(inconnu)"
+            raise ScoValueError(
+                f"decision absente pour l'étudiant {nomprenom} ({etudid})"
+            )
         # resultat du semestre
         decision_apo = ScoDocSiteConfig.get_code_apo(decision["code"])
         note = nt.get_etud_moy_gen(etudid)