diff --git a/app/but/bulletin_but_xml_compat.py b/app/but/bulletin_but_xml_compat.py
index 279f928477..1369eb672b 100644
--- a/app/but/bulletin_but_xml_compat.py
+++ b/app/but/bulletin_but_xml_compat.py
@@ -182,7 +182,10 @@ def bulletin_but_xml_compat(
                 # Liste ici uniquement les modules rattachés à cette UE
                 if modimpl.module.ue.id == ue.id:
                     # mod_moy = scu.fmt_note(results.etud_moy_ue[ue.id][etud.id])
-                    coef = results.modimpl_coefs_df[modimpl.id][ue.id]
+                    try:
+                        coef = results.modimpl_coefs_df[modimpl.id][ue.id]
+                    except KeyError:
+                        coef = 0.0
                     x_mod = Element(
                         "module",
                         id=str(modimpl.id),