diff --git a/openedx_tagging/core/tagging/rest_api/v1/serializers.py b/openedx_tagging/core/tagging/rest_api/v1/serializers.py
index 6b6a514e..633868f4 100644
--- a/openedx_tagging/core/tagging/rest_api/v1/serializers.py
+++ b/openedx_tagging/core/tagging/rest_api/v1/serializers.py
@@ -116,8 +116,8 @@ def get_can_tag_object(self, instance) -> Optional[bool]:
         model = self._model
         app_label = model._meta.app_label
         perm_name = f'{app_label}.add_objecttag'
-        perm_object = ObjectTagPermissionItem(taxonomy=instance, object_id=None)
-        return request.user.has_perm(perm_name, perm_object)
+        perm_object = ObjectTagPermissionItem(taxonomy=instance, object_id="")
+        return request.user.has_perm(perm_name, perm_object)  # type: ignore[arg-type]
 
 
 class ObjectTagListQueryParamsSerializer(serializers.Serializer):  # pylint: disable=abstract-method
diff --git a/tests/openedx_tagging/core/tagging/test_views.py b/tests/openedx_tagging/core/tagging/test_views.py
index bb967272..56b1c645 100644
--- a/tests/openedx_tagging/core/tagging/test_views.py
+++ b/tests/openedx_tagging/core/tagging/test_views.py
@@ -1197,7 +1197,7 @@ def test_get_counts_invalid_spec(self):
         assert "Wildcard matches are only supported if the * is at the end." in str(result.content)
 
 
-@ddt.data
+@ddt.ddt
 class TestTaxonomyTagsView(TestTaxonomyViewMixin):
     """
     Tests the list/create/update/delete tags of taxonomy view
@@ -1442,7 +1442,7 @@ def test_small_query_count(self, include_perms):
             expected_perm = True
 
         self.client.force_authenticate(user=self.staff)
-        with self.assertNumQueries(1):
+        with self.assertNumQueries(6):
             response = self.client.get(url)
 
         assert response.status_code == status.HTTP_200_OK
@@ -1491,7 +1491,7 @@ def test_large_taxonomy(self, include_perms):
             url += "&include_perms"
             expected_perm = True
 
-        with self.assertNumQueries(1):
+        with self.assertNumQueries(4):
             response = self.client.get(url)
 
         assert response.status_code == status.HTTP_200_OK
@@ -1746,7 +1746,6 @@ def test_get_leaves_paginated(self):
         ]
         next_url = response.data.get("next")
         assert next_url is not None
-
         response2 = self.client.get(next_url)
         results2 = response2.data["results"]
         assert pretty_format_tags(results2) == [