Update values not wrapped in quotes... error

[eluser]w1n78[/eluser]
i'm trying to update a table with values from an array.

controller

Code:

class Collection_controller extends CI_Controller
{
public function __construct()
{
  parent::__construct();
  $this->load->model('collection_model');
  $this->load->library('amazon_api_class');
  
  $this->auth_library->check_auth('admin, user');
  $this->output->enable_profiler(TRUE);
}

public function detail()
{
  $this->load->model('movie_model');
  // update movie record
  $this->collection_model->update_movie($this->uri->segment(3), FALSE);
  
  $data['page_title']   = 'Collection Detail';
  $data['results'] = $this->collection_model->get_one($this->uri->segment(3));
  
  $this->load->view('templates/header', $data);
  $this->load->view('collection/detail', $data);
  $this->load->view('templates/footer');
}
}

model

Code:

class Collection_model extends CI_Model
{
public function __construct()
{
  parent::__construct();
  $this->load->database();
}
public function update_movie($asin, $check_time = TRUE)
{
  $results = $this->common_library->parse_amazon_data($this->amazon_api_class->getItemByAsin($asin));
  
  
  $this->title  = $results[0]["title"];
  
  $this->db->set('title', $this->title);
  $this->db->where('asin', $asin);

         $this->db->update('movie');
  
  
}
}

here's the error

Code:

A Database Error Occurred

Error Number: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Street: Preschool Is Cool! ABCs with Elmo WHERE `asin` = 'B003ITZBV8'' at line 1

UPDATE `movie` SET `title` = Sesame Street: Preschool Is Cool! ABCs with Elmo WHERE `asin` = 'B003ITZBV8'

i don't know why it's not wrapping the value in quotes. i've also tried $db->escape() and $db->escape_str(). the update values are from an array.

what am i doing wrong? did i miss something?