PHP Error nach 5.0.4 Update

Hi,

wir haben von 5.0.1. auf 5.0.4 geupdatet. Seit dem Update haben wir einen PHP Error

2015/10/13 15:32:40 [error] 30270#0: *36554 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught exception 'Zend_Session_Exception' with message 'Zend_Session is currently marked as read-only.' in /www/httpd/www.homeliving.de/html/engine/Library/Zend/Session/Abstract.php:112
Stack trace:
#0 /www/httpd/www.homeliving.de/html/engine/Library/Zend/Session/Namespace.php(414): Zend_Session_Abstract::_namespaceUnset('Shopware', 'sUserMail')
#1 /www/httpd/www.homeliving.de/html/engine/Library/Enlight/Components/Session/Namespace.php(54): Zend_Session_Namespace->__unset('sUserMail')
#2 /www/httpd/www.homeliving.de/html/engine/Shopware/Core/sAdmin.php(1372): Enlight_Components_Session_Namespace->offsetUnset('sUserMail')
#3 /www/httpd/www.homeliving.de/html/engine/Shopware/Plugins/Community/Frontend/StcomTemplateDashone/Controllers/Widgets/StcomEasyLogin.php(30): sAdmin->sCheckUser()
#4 /www/httpd/www.homeliving.de/html/engine/Library/Enlight/Controller/Action.php(159): Shopware_Controllers_Widgets_StcomEasyLogin->showLoginWindowAction()
#5 /www/httpd/www.homeliving.de/ht" while reading response header from upstream, client: xxx.xxx.xxx.xxx, server: www.homeliving.de, request: "GET /aussenbeleuchtung?p=1&f=1759%7C1780%7C1779%7C1762%7C1769%7C20442 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "www.homeliving.de"

hat jemand eine idee woran das liegen kann bzw. wie es zu beheben ist?

Gruss
Alex