Warning: Undefined variable $block in /var/www/magento/html/app/code/MagicToolbox/MagicZoomPlus/view/frontend/templates/html/head.phtml on line 7

Fatal error: Uncaught Error: Call to a member function isVisibile() on null in /var/www/magento/html/app/code/MagicToolbox/MagicZoomPlus/view/frontend/templates/html/head.phtml:7 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/MagicToolbox/MagicZoomPlus/view/frontend/templates/html/head.phtml on line 7