diff --git a/app/scodoc/sco_evaluations.py b/app/scodoc/sco_evaluations.py
index 22aa43ebc..382f883dd 100644
--- a/app/scodoc/sco_evaluations.py
+++ b/app/scodoc/sco_evaluations.py
@@ -691,7 +691,7 @@ def evaluation_describe(evaluation_id="", edit_in_place=True, link_saisie=True)
                     group_ids=group_id,
                     evaluation_id=evaluation.id,
                     date_debut=evaluation.date_debut.isoformat(),
-                    date_fin=evaluation.date_fin.isoformat(),
+                    date_fin=evaluation.date_fin.isoformat() if evaluation.date_fin else "",
                     )
                     }">absences ce jour</a>
                     </span>