diff --git a/app/comp/res_common.py b/app/comp/res_common.py
index 3315f003..52d5cd90 100644
--- a/app/comp/res_common.py
+++ b/app/comp/res_common.py
@@ -808,9 +808,15 @@ class ResultatsSemestre(ResultatsCache):
                         coef = modimpl.module.coefficient or 0
                     row_coef[colid] = fmt_note(coef)
                     notes = self.modimpl_notes(modimpl.id, ue.id)
-                    row_min[colid] = fmt_note(np.nanmin(notes))
-                    row_max[colid] = fmt_note(np.nanmax(notes))
-                    moy = np.nanmean(notes)
+                    if np.isnan(notes).all():
+                        # aucune note valide
+                        row_min[colid] = np.nan
+                        row_max[colid] = np.nan
+                        moy = np.nan
+                    else:
+                        row_min[colid] = fmt_note(np.nanmin(notes))
+                        row_max[colid] = fmt_note(np.nanmax(notes))
+                        moy = np.nanmean(notes)
                     row_moy[colid] = fmt_note(moy)
                     if np.isnan(moy):
                         # aucune note dans ce module