Magento 1.9 Admin Panel Gives 404 Error When Entering CMS Pages – Fix

The menu is rendered using either the defined cms hierarchy node or falls back to the one found in the registry.

You can check the Enterprise_Cms_Block_Hierarchy_Menu file. The logic for selecting a node can be found in the _construct method.

    if ($this->getNodeId()) {
        $this->_node = Mage::getModel('enterprise_cms/hierarchy_node')
            ->load($this->getNodeId());
    } else {
        $this->_node = Mage::registry('current_cms_hierarchy_node');
    }

Upon rendering the cms/hierarchy/menu.phtml file. The getTree() method is executed. This method uses the $this->_node value, which is not defined on a non-cms page. Hence the page halts during rendering.

If you want to display this menu on all the pages you need to extend the _construct method of this block to always fall back to the top nodeId in the hierarchy. Or to a pre-defined ID (via a configuration item for example) when the node you want to use is not the top node in the full hierarchy of cms pages.

You are getting a 404 on CMS pages because of the remains of old store views still hanging around in the database after deleting store views from Magento admin, to clean up ( delete ) old unused CMS pages for store views you have deleted run this MySQL cmd.

DELETE FROM cms_page_store WHERE store_id NOT IN (SELECT store_id FROM core_store) You could also use an app like phpmyadmin to manually look for CMS entries that have store IDs that you know not to be in use, but this could get messy.