Fatal error: Call to a member function row() on a non-object

[eluser]BrandonDurham[/eluser]
Why would this be happening here?

Code:

$sql = "UPDATE prizes SET
    email                 = '$email',
    fname                = '$first_name',
    lname                = '$last_name',
    address1            = '$address',
    address2             = '$add_address',
    city                 = '$city',
    state                 = '$state',
    zip                  = '$zip',
    date_submitted      = '$date_submitted',
    opt_in                 = '$opt_in',
    company             = '$company',
    day_phone            = '$day_phone',
    evening_phone        = '$evening_phone'
    WHERE id            = '8'
";

$query = $this->db->query($sql);
$row = $query->row();

Here's the full error:

Fatal error: Call to a member function row() on a non-object in /Users/Deefee/Documents/Sites/073MHG232/system/application/models/db_functions.php on line 88

Line 88 is $row = $query->row();.