diff --git a/netbox_acls/api/serializers.py b/netbox_acls/api/serializers.py
index 46f24cb..ce6b1f6 100644
--- a/netbox_acls/api/serializers.py
+++ b/netbox_acls/api/serializers.py
@@ -122,8 +122,6 @@ def validate(self, data):
             - Check that the GFK object is valid.
             - Check if Access List has no existing rules before change the Access List's type.
         """
-        error_message = {}
-
         # Check that the GFK object is valid.
         assigned_object = validate_gfk(data)
 
@@ -137,7 +135,7 @@ def validate(self, data):
                 {"type": ["This ACL has ACL rules associated, CANNOT change ACL type."]}
             )
 
-        if error_message:
+        if error_message := {}:
             raise serializers.ValidationError(error_message)
 
         return super().validate(data)
diff --git a/netbox_acls/tests/test_api.py b/netbox_acls/tests/test_api.py
index 2dd5745..d44371d 100644
--- a/netbox_acls/tests/test_api.py
+++ b/netbox_acls/tests/test_api.py
@@ -18,7 +18,7 @@ def test_root(self):
         Test the API root
         """
         url = reverse("plugins-api:netbox_acls-api:api-root")
-        response = self.client.get("{}?format=api".format(url), **self.header)
+        response = self.client.get(f"{url}?format=api", **self.header)
 
         self.assertEqual(response.status_code, status.HTTP_200_OK)