Description:
------------
I am use a zend framework version 1 and this framework have a class Zend_Session_Namespace with code:
<code>
        if (!isset($_SESSION['__ZF'])) {
            return; // no further processing needed
        }
</code>
And this code throw exception: Zend_Session_Exception with message: 
The session has already been started.  The session id must be set first.

I am using two browsers:
in firefox - all ok
in opera I have this bug


On php 5.6 this code work normally

Test script:
---------------
        if (!isset($_SESSION['__ZF'])) {
            return; // no further processing needed
        }