Description:
------------
if you evaluate the code in the
textarea (Reproduce code), it works.
But I've reloaded the page (my be you have to
reload more than two times) and Apache/1.3.24
crash.

If I run the code without the marked
'&' (reference' it run always correct.

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

class PTestClass
{
   var $str = "hello, world";
};

   session_start();
   $var = new PTestClass;
   $_SESSION['modules']['test'] = $var;

   if( !isset($_SESSION['m']) ) {
      $_SESSION['m'] = &$_SESSION['modules']['test'];
      //               ^
      
   }

   var_dump($_SESSION['m']);
?>

Expected result:
----------------
see the var_dump outputs.

Actual result:
--------------
apache crashs