After installing the security patch SUPEE-7405 I have got the following error in the backend:
Mage registry key "_singleton/Mage_Core_Model_Domainpolicy" already exists
I tried to clear the cache, but no change.
Does someone know how to fix this?
EDIT: As a workaround I did the following:
if(isset(self::$_registry["_singleton/Mage_Core_Model_Domainpolicy"])) {
self::unregister("_singleton/Mage_Core_Model_Domainpolicy");
}
in the Mage.php
. This works for the moment, but does anyone know how to find out in which files the key is setted?