Possible fix

backend/server.js

@@ -71,7 +71,7 @@ app.get('/callback', function (req, res) {
     let uri = process.env.FRONTEND_URI || 'http://localhost:3000/'
     uri= uri + '?access_token=' + access_token
     console.log(req.query.state);
-    if (typeof req.query.state.from!=="undefined"){
+    if (req.query.state.hasOwnProperty('from')){
       uri=uri+`&from=${req.query.state.from}`
     }
     res.redirect(uri + '?access_token=' + access_token)