Cannot read property 'urlslist' of null

Here "user" is a collection of usernames, email, password, and an array of id. These ids belong to a collection "urllist".when I am doing console.log(resp.urlslist) it is giving an array of objects. but when passing the same result using res.render("finalsite",{linklist:resp.urlslist}) then urlslist is null error is occurring:

app.get("/finalsite/:use", function (req, res) {    
  user.findOne({username:req.params.use})    
    .populate("urlslist")      
    .exec()    
    .then((resp) => {     
      console.log(resp.urlslist);
      res.render("finalsite",{ linklist:resp.urlslist });

  })    
  .catch((err) => {
    console.log(err);});
  });