Fatal error: Uncaught Error: Call to a member function dispatch() on null in /var/www/html/vendor/magento/framework/View/Element/AbstractBlock.php:652 Stack trace: #0 /var/www/html/vendor/magento/framework/View/Layout.php(557): Magento\Framework\View\Element\AbstractBlock->toHtml() #1 /var/www/html/vendor/magento/framework/View/Layout.php(533): Magento\Framework\View\Layout->_renderBlock('group_list') #2 /var/www/html/vendor/magento/framework/View/Layout.php(488): Magento\Framework\View\Layout->renderNonCachedElement('group_list') #3 /var/www/html/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->renderElement('group_list', false) #4 /var/www/html/vendor/magento/framework/View/Layout.php(535): Magento\Framework\View\Layout->_renderContainer('sidebar.main', false) #5 /var/www/html/vendor/magento/framework/View/Layout.php(488): Magento\Framework\View\Layout->renderNonCachedElement('sidebar.main') #6 /var/www/html/vendor/magento/framework/View/Layout.php(585): Magento\Framework\View\Layout->render in /var/www/html/vendor/magento/framework/View/Element/AbstractBlock.php on line 652