Description:
------------
MySQLi function real_escape_string causes an internal server error

I'm using:
- VC6 x86 PHP 5.3.0 Windows binary (the problem there is both on thread safe and non thread safe versions) with MySQLi extension support
- Apache 2.2.10
- MySQL 6.0.7 alpha



Reproduce code:
---------------
<?php
$SQL = new mysqli('localhost', 'root', 'password', 'database');
echo $SQL->real_escape_string('aaa');
?>

or

<?php
$SQL = mysqli_connect('localhost', 'root', 'password', 'database');
echo mysqli_real_escape_string($SQL, 'aaa');
?>

Expected result:
----------------
the code expected to return the string "aaa" like in PHP 5.2.x

Actual result:
--------------
while executing it causes Error 500 (Internal Server Error), with "Premature end of script headers: php-cgi.exe" entry in Apache error log.