diff --git a/src/App.js b/src/App.js
index 32979c9..07cbe7c 100644
--- a/src/App.js
+++ b/src/App.js
@@ -17,7 +17,7 @@ const gradeOptions = [
 
 const App = () => {
   const [data, setData] = useState(output);
-  const [preview, setPreview] = useState(undefined);
+  const [preview, setPreview] = useState(null);
 
   const handlePreview = () => {
     setPreview({ ...data });