diff --git a/management/commands/refresh_activities.py b/management/commands/refresh_activities.py
index c03240f..c92bec0 100644
--- a/management/commands/refresh_activities.py
+++ b/management/commands/refresh_activities.py
@@ -24,7 +24,7 @@ class Command(BaseCommand):
  * Ne pas éditer cette page manuellement, toute modification sera annulée automatiquement.
  * Pour annoncer un nouvel événement, rendez-vous sur {activities_url}
 
-""".format(activities_url="https://" + os.getenv("NOTE_URL") + reverse("activity:activity_list"))
+""".format(activities_url="https://" + os.getenv("NOTE_URL", "") + reverse("activity:activity_list"))
 
     @staticmethod
     def connection(url):