MY_Model Base CRUD Model

[eluser]Keylocker[/eluser]
I am having HUGE problems with memory when I try to use the functions get_many, get_many_by and get_all

here's my controller code

Code:

// List all addresses of a given user
public function index( $user_id = NULL )
{
  $this->load->model('addresses_model', 'addresses');
  $addr = $this->addresses->get_many_by( array('user_id' => $user_id) );

  print_r($addr); //debug
}

in the model

Code:

class Addresses_model extends MY_Model {

public function __construct()
{
  // Load base construct
  parent::__construct();
}
}

The error i get is

Code:

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 40 bytes) in
/application/models/addresses_model.php on line 20

For the record. I tried with $this->db->get() and everything works perfectly. The problem appears just using MY_Model.php
What can I do? Please help.