Returning to an http zone from an https one, the following error is generated:

Fatal error: Call to a member function on a non-object in /var/www/ezpublish-3.9.0rc1/kernel/classes/ezsslzone.php on line 232

The problem seems to be solved adding:

$ini =& ezZINI::instance();

before line 232.

Steps to reproduce

Define an SSL zone, enter the zone then go back to a non SSL zone.