diff --git a/app/but/cursus_but.py b/app/but/cursus_but.py
index 4a16bf05..e2c45c9f 100644
--- a/app/but/cursus_but.py
+++ b/app/but/cursus_but.py
@@ -512,6 +512,8 @@ def formation_semestre_niveaux_warning(formation: Formation, semestre_idx: int)
     """
     annee = (semestre_idx - 1) // 2 + 1  # année BUT
     ref_comp: ApcReferentielCompetences = formation.referentiel_competence
+    if not ref_comp:
+        return ""  # détecté ailleurs...
     niveaux_sans_ue_by_parcour = {}  # { parcour.code : [ ue ... ] }
     parcours_ids = {
         uep.parcours_id
diff --git a/app/scodoc/sco_edit_apc.py b/app/scodoc/sco_edit_apc.py
index b56a9393..805fa1fb 100644
--- a/app/scodoc/sco_edit_apc.py
+++ b/app/scodoc/sco_edit_apc.py
@@ -28,7 +28,6 @@
 from flask.templating import render_template
 
 from app import db
-from app.but import cursus_but
 from app.models import UniteEns, Matiere, Module, FormSemestre, ModuleImpl
 from app.models.validations import ScolarFormSemestreValidation
 from app.scodoc import codes_cursus
@@ -48,6 +47,8 @@ def html_edit_formation_apc(
     - Les ressources
     - Les SAÉs
     """
+    from app.but import cursus_but
+
     cursus = formation.get_cursus()
     assert cursus.APC_SAE