Warning: Undefined variable $block in /var/www/magento/html/app/design/frontend/bbnt/base/Magento_Checkout/templates/cart/item/default.phtml on line 6

Fatal error: Uncaught Error: Call to a member function getItem() on null in /var/www/magento/html/app/design/frontend/bbnt/base/Magento_Checkout/templates/cart/item/default.phtml:6 Stack trace: #0 {main} thrown in /var/www/magento/html/app/design/frontend/bbnt/base/Magento_Checkout/templates/cart/item/default.phtml on line 6