Description:
------------
Hi,


this code says more than 1000 words ;)

Reproduce code:
---------------
<?php
session_start();

if(!isset($_SESSION['xml']))
{
	$xml = simplexml_load_string('<?xml version="1.0" encoding="UTF-8"?> <blah></blah>');
	$_SESSION['xml'] = $xml;

	echo "Session variable set... Please hit F5";
}
else
{
	$wtf = $_SESSION['xml'];
	if($wtf) echo 'lol'; // This triggers the error
}

?>

Actual result:
--------------
Warning: session_start() [function.session-start]: Node no longer exists in /var/www/phperr.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /var/www/phperr.php:2) in /var/www/phperr.php on line 2

Warning: main() [function.main]: Node no longer exists in /var/www/phperr.php on line 14

Warning: Unknown: Node no longer exists in Unknown on line 0