Fix

backend/server.js

@@ -72,9 +72,9 @@ app.get('/callback', function (req, res) {
     uri= uri + '?access_token=' + access_token
     console.log(req.query.state);
     if (req.query.state.hasOwnProperty('from')){
-      uri=uri+`&from=${req.query.state.from}`
+      uri=uri+`?from=${req.query.state.from}`
     }
-    res.redirect(uri + '?access_token=' + access_token)
+    res.redirect(uri + '&access_token=' + access_token)
   })
 });