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<?php
...
        if (!$this->getFlag('', self::FLAG_NO_START_SESSION)) {
            $checkCookie = in_array($this->getRequest()->getActionName(), $this->_cookieCheckActions);
            $checkCookie = $checkCookie && !$this->getRequest()->getParam('nocookie', false);
            $cookies = Mage::getSingleton('core/cookie')->get();
            if ($checkCookie && empty($cookies)) {
                $this->setFlag('', self::FLAG_NO_COOKIES_REDIRECT, true);
            }
            Mage::getSingleton('core/session', array('name' => $this->_sessionNamespace))->start();
        }