diff --git a/zerver/lib/typed_endpoint.py b/zerver/lib/typed_endpoint.py
index f34e24257a..1d8d7520b3 100644
--- a/zerver/lib/typed_endpoint.py
+++ b/zerver/lib/typed_endpoint.py
@@ -316,6 +316,7 @@ def parse_view_func_signature(
 ERROR_TEMPLATES = {
     "bool_parsing": _("{var_name} is not a boolean"),
     "bool_type": _("{var_name} is not a boolean"),
+    "dataclass_type": _("{var_name} does not have the expected format"),
     "datetime_parsing": _("{var_name} is not a date"),
     "datetime_type": _("{var_name} is not a date"),
     "dict_type": _("{var_name} is not a dict"),
diff --git a/zerver/tests/test_user_groups.py b/zerver/tests/test_user_groups.py
index 0a69fd8e6b..c3c3dc77cc 100644
--- a/zerver/tests/test_user_groups.py
+++ b/zerver/tests/test_user_groups.py
@@ -1319,6 +1319,11 @@ class UserGroupAPITestCase(UserGroupTestCase):
         leadership_group.deactivated = False
         leadership_group.save()
 
+        # Test updating with value not in the form of GroupSettingChangeRequest
+        params[setting_name] = orjson.dumps(support_group.id).decode()
+        result = self.client_patch(f"/json/user_groups/{leadership_group.id}", info=params)
+        self.assert_json_error(result, f"{setting_name} does not have the expected format")
+
     def test_update_user_group_permission_settings(self) -> None:
         hamlet = self.example_user("hamlet")
         check_add_user_group(hamlet.realm, "support", [hamlet], acting_user=hamlet)