title: Get error node.js mongodb cannot read property 0 of null for records after successfull insert
body: <p>I used db.collection.insert method to add a document in mongodb with function(err,records) callback. Though insertion succeeds (I checked on mongolab the record), records is null so that It throws error at records[0]._id</p>
  
  <p>Is it a node.js bug on nitrous.io which I'm testing ?</p>
  
  <pre><code>MongoClient.connect(uri, function (err, db) {
      if (err) {
          throw err;
      } else {
          console.log("successfully connected to the database");
  
          // Insert document in MongoDb Collection
                  var document = {title:'test',category:'node.js'}
  
                  db.collection('tut').insert(document, function(err,records){
                          //if (err) throw err;
                          console.log('inserted record id: ' + records[0]._id);
                    });
      }
      db.close();
  });
  </code></pre>