not able to update query by id

Code:

public function update_user($id, $sessArray)
{
$id = $this->session->userdata('id');
//echo '<pre>'; var_dump($id); echo '</pre>';
//die();
  $this->db->set($sessArray);
    $this->db->where('id', $id);
    $this->db->update('register');

}

Check have data in $id and $sessArray

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