Fatal error: Uncaught TypeError: Return value of Shopware_Controllers_Frontend_Checkout::isShippingAllowed() must be of the type boolean, null returned in /var/www/html/engine/Shopware/Controllers/Frontend/Checkout.php:2192 Stack trace: #0 /var/www/html/engine/Shopware/Controllers/Frontend/Checkout.php(180): Shopware_Controllers_Frontend_Checkout->isShippingAllowed(2) #1 /var/www/html/engine/Library/Enlight/Controller/Action.php(192): Shopware_Controllers_Frontend_Checkout->cartAction() #2 /var/www/html/engine/Library/Enlight/Controller/Dispatcher/Default.php(478): Enlight_Controller_Action->dispatch('cartAction') #3 /var/www/html/engine/Library/Enlight/Controller/Front.php(228): Enlight_Controller_Dispatcher_Default->dispatch(Object(Enlight_Controller_Request_RequestHttp), Object(Enlight_Controller_Response_ResponseHttp)) #4 /var/www/html/engine/Shopware/Kernel.php(188): Enlight_Controller_Front->dispatch() #5 /var/www/html/vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php(102): Shopware\Kernel->handle(Object(Sy in /var/www/html/engine/Shopware/Controllers/Frontend/Checkout.php on line 2192