fix frontend error toast bug

frontend/frontend/src/pages/App/AppTrends.js

@@ -20,7 +20,7 @@ import 'react-toastify/dist/ReactToastify.css';
 function App() {
   const toMessage = (input) => {
     if (typeof input === 'string') return input;
-    if (input.reason.message) return input.reason.message;
+    if (input.reason?.message) return input.reason.message;
     if (input.message) return input.message;
     try {
       return JSON.stringify(input);