diff --git a/app/but/bulletin_but_pdf.py b/app/but/bulletin_but_pdf.py
index 0aa22fcfe..0d5b6b2df 100644
--- a/app/but/bulletin_but_pdf.py
+++ b/app/but/bulletin_but_pdf.py
@@ -189,7 +189,9 @@ class BulletinGeneratorStandardBUT(BulletinGeneratorStandard):
             moy_ue = moy_ue.get("value", "-") if moy_ue is not None else "-"
         t = {
             "titre": f"{ue_acronym} - {ue['titre']}",
-            "moyenne": Paragraph(f"""<para align=right><b>{moy_ue}</b></para>"""),
+            "moyenne": Paragraph(
+                f"""<para align=right><b>{moy_ue or "-"}</b></para>"""
+            ),
             "_css_row_class": "note_bold",
             "_pdf_row_markup": ["b"],
             "_pdf_style": [