diff --git a/src/python-fastui/fastui/components/__init__.py b/src/python-fastui/fastui/components/__init__.py
index 0fb50862..ca151d20 100644
--- a/src/python-fastui/fastui/components/__init__.py
+++ b/src/python-fastui/fastui/components/__init__.py
@@ -185,7 +185,7 @@ def __get_pydantic_json_schema__(
     ) -> _t.Any:
         # until https://github.com/pydantic/pydantic/issues/8413 is fixed
         json_schema = handler(core_schema)
-        json_schema['required'].append('links')
+        json_schema.setdefault('required', []).append('links')
         return json_schema
 
 
diff --git a/src/python-fastui/tests/test_json_schema.py b/src/python-fastui/tests/test_json_schema.py
index f01cd60c..c6ba4b45 100644
--- a/src/python-fastui/tests/test_json_schema.py
+++ b/src/python-fastui/tests/test_json_schema.py
@@ -1,6 +1,8 @@
 from dirty_equals import IsPartialDict
-from fastui import FastUI
+from fastapi import FastAPI
+from fastui import FastUI, components
 from fastui.generate_typescript import generate_json_schema
+from httpx import AsyncClient
 
 
 async def test_json_schema():
@@ -12,3 +14,25 @@ async def test_json_schema():
         'type': 'array',
     }
     # TODO test more specific cases
+
+
+async def test_openapi():
+    app = FastAPI()
+
+    @app.get('/api/', response_model=FastUI, response_model_exclude_none=True)
+    def test_endpoint():
+        return [components.Text(text='hello')]
+
+    async with AsyncClient(app=app, base_url='http://test') as client:
+        r = await client.get('/openapi.json')
+        assert r.status_code == 200
+        assert r.headers['content-type'] == 'application/json'
+        assert r.json() == {
+            'openapi': '3.1.0',
+            'info': {
+                'title': 'FastAPI',
+                'version': '0.1.0',
+            },
+            'paths': IsPartialDict(),
+            'components': IsPartialDict(),
+        }