diff --git a/certego_saas/apps/notifications/migrations/0004_for_user_blank.py b/certego_saas/apps/notifications/migrations/0004_for_user_blank.py
new file mode 100644
index 0000000..a9b6d76
--- /dev/null
+++ b/certego_saas/apps/notifications/migrations/0004_for_user_blank.py
@@ -0,0 +1,23 @@
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("certego_saas_notifications", "0003_for_user"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="notification",
+            name="for_user",
+            field=models.ForeignKey(
+                settings.AUTH_USER_MODEL,
+                related_name="notifications",
+                help_text="If the field is empty, the notification is for everyone; otherwise only for the specified user",
+                null=True,
+                blank=True,
+                on_delete=models.CASCADE,
+            ),
+        ),
+    ]
diff --git a/certego_saas/apps/notifications/models.py b/certego_saas/apps/notifications/models.py
index bdb21b8..fecfa57 100644
--- a/certego_saas/apps/notifications/models.py
+++ b/certego_saas/apps/notifications/models.py
@@ -29,6 +29,7 @@ class Notification(TimestampedModel, AppSpecificModel):
         help_text="If the field is empty, the notification is for everyone; otherwise only for the specified user",
         null=True,
         on_delete=models.CASCADE,
+        blank=True,
     )
 
     def is_read_by_user(self, user) -> bool:
diff --git a/certego_saas/apps/organization/organization.py b/certego_saas/apps/organization/organization.py
index 8e1d591..6d9f94c 100644
--- a/certego_saas/apps/organization/organization.py
+++ b/certego_saas/apps/organization/organization.py
@@ -68,7 +68,7 @@ def create(cls, name: str, owner: "User"):
 
             org = cls.objects.create(name=name)
             membership = Membership.objects.create(
-                user=owner, organization=org, is_owner=True
+                user=owner, organization=org, is_owner=True, is_admin=True
             )
             org.members.add(membership)
             org.save()
diff --git a/certego_saas/version.py b/certego_saas/version.py
index b90c97e..2400ae8 100644
--- a/certego_saas/version.py
+++ b/certego_saas/version.py
@@ -1 +1 @@
-VERSION = "0.7.1"
+VERSION = "0.7.2"