Error: Call to undefined function array_key_first() in /home/lornithowj/www/override/controllers/front/ProductController.php:311 Stack trace: #0 /home/lornithowj/www/controllers/front/ProductController.php(376): ProductController->assignAttributesGroups(Object(PrestaShop\PrestaShop\Adapter\Presenter\Product\ProductLazyArray)) #1 /home/lornithowj/www/classes/controller/Controller.php(281): ProductControllerCore->initContent() #2 /home/lornithowj/www/classes/Dispatcher.php(511): ControllerCore->run() #3 /home/lornithowj/www/index.php(28): DispatcherCore->dispatch() #4 {main}