diff --git a/app/models/formsemestre.py b/app/models/formsemestre.py
index a6411f70f..41ede854f 100644
--- a/app/models/formsemestre.py
+++ b/app/models/formsemestre.py
@@ -206,7 +206,11 @@ class FormSemestre(db.Model):
         modimpls = self.modimpls.all()
         if self.formation.is_apc():
             modimpls.sort(
-                key=lambda m: (m.module.module_type, m.module.numero, m.module.code)
+                key=lambda m: (
+                    m.module.module_type or 0,
+                    m.module.numero or 0,
+                    m.module.code or 0,
+                )
             )
         else:
             modimpls.sort(