Description:
------------
Every time when I call AMQPQueue::consume "Segmentation 
fault" appears. After debugging this module I've found that 
this error in file "amqp_queue.c" line 601

"int messages_in_queue = r->message_count;"


RabbitMQ 2.4.1

Reproduce code:
---------------
<?php

$connection = new AMQPConnection();
$connection->connect();

$queue = new AMQPQueue($connection, 'test');
$options = array(
 'min' => 1,
 'max' => 5,
 'ack' => true
);

$messages = $queue->consume($options);

foreach ($messages as $message) {
    echo $message['message_body'];
}

?>

Expected result:
----------------
returned messages

Actual result:
--------------
"Segmentation fault" after $queue->consume