diff --git a/site_settings/migrations/0002_auto_20210324_1604.py b/site_settings/migrations/0002_auto_20210324_1604.py
new file mode 100644
index 0000000000000000000000000000000000000000..895f442ad0f1f11db36274102dee0f949a8e931b
--- /dev/null
+++ b/site_settings/migrations/0002_auto_20210324_1604.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.0.8 on 2021-03-24 15:04
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('site_settings', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='sitesettings',
+            name='activity_submission_form',
+            field=models.CharField(blank=True, default='', max_length=200, null=True, verbose_name='Lien pour soumettre une activité'),
+        ),
+    ]
diff --git a/site_settings/models.py b/site_settings/models.py
index 9b061a521c9825943bec25dceebde6ad698a7c27..714f1eaf3e480426761bbb0f8266675c9910a1d4 100644
--- a/site_settings/models.py
+++ b/site_settings/models.py
@@ -56,7 +56,10 @@ class SiteSettings(SingletonModel):
 		help_text="Suppose que l'allocation des activités a été effectuée."
 	)
 
-	activity_submission_form = models.CharField("Lien pour soumettre une activité", max_length=200, default="")
+	activity_submission_form = models.CharField(
+		"Lien pour soumettre une activité", max_length=200, default="",
+		blank=True, null=True
+	)
 
 	allow_mass_mail = models.BooleanField(
 		"Permettre l'envoi de mails collectifs (aux utilisateurs et orgas)", default=False,