codeigniter show error adding time

Try to get last query and direct hit mysql query in database than you can easily get what exact problem in that.

function getUserDataById($user_id)
{
$this->db->where('id',$user_id);
$query = $this->db->get('tbl_users');
$result = $query->row();
echo $this->db->last_query(); die;
return $result;
}