diff --git a/src/documents/serialisers.py b/src/documents/serialisers.py
index 83d250eaa..956da8129 100644
--- a/src/documents/serialisers.py
+++ b/src/documents/serialisers.py
@@ -591,7 +591,8 @@ class TagSerializer(MatchingModelSerializer, OwnedObjectSerializer):
                 self.instance.parent = parent
                 self.instance.clean()
             except ValidationError as e:
-                raise serializers.ValidationError({"parent": list(e)})
+                logger.debug("Tag parent validation failed: %s", e)
+                raise serializers.ValidationError({"parent": _("Invalid parent tag.")})
             finally:
                 self.instance.parent = original_parent
         else:
@@ -600,7 +601,8 @@ class TagSerializer(MatchingModelSerializer, OwnedObjectSerializer):
             try:
                 temp.clean()
             except ValidationError as e:
-                raise serializers.ValidationError({"parent": list(e)})
+                logger.debug("Tag parent validation failed: %s", e)
+                raise serializers.ValidationError({"parent": _("Invalid parent tag.")})
 
         return super().validate(attrs)
 
diff --git a/src/documents/tests/test_tag_hierarchy.py b/src/documents/tests/test_tag_hierarchy.py
index 14ba3cce4..accf8f85b 100644
--- a/src/documents/tests/test_tag_hierarchy.py
+++ b/src/documents/tests/test_tag_hierarchy.py
@@ -161,7 +161,7 @@ class TestTagHierarchy(APITestCase):
         )
         assert resp_fail.status_code == 400
         assert "parent" in resp_fail.data
-        assert any("Maximum" in str(msg) for msg in resp_fail.data["parent"])
+        assert "Invalid" in str(resp_fail.data["parent"])
 
     def test_max_depth_on_move_subtree(self):
         a = Tag.objects.create(name="A2")