Fatal error: Uncaught TypeError: Return value of Shopware_Controllers_Frontend_Checkout::isShippingAllowed() must be of the type boolean, null returned in /html/shopware/engine/Shopware/Controllers/Frontend/Checkout.php:2192 Stack trace: #0 /html/shopware/engine/Shopware/Controllers/Frontend/Checkout.php(180): Shopware_Controllers_Frontend_Checkout->isShippingAllowed(2) #1 /html/shopware/var/cache/production_202005221140/proxies/ShopwareControllersFrontendCheckoutProxy.php(79): Shopware_Controllers_Frontend_Checkout->cartAction() #2 /html/shopware/engine/Library/Enlight/Hook/HookExecutionContext.php(137): Shopware_Proxies_ShopwareControllersFrontendCheckoutProxy->__executeOriginalMethod('cartAction', Array) #3 /html/shopware/engine/Library/Enlight/Hook/HookExecutionContext.php(103): Enlight_Hook_HookExecutionContext->executeReplaceChain(Array) #4 /html/shopware/engine/Library/Enlight/Hook/HookManager.php(180): Enlight_Hook_HookExecutionContext->execute() #5 /html/shopware/var/cache/production_202005221140/proxies/Shopware in /html/shopware/engine/Shopware/Controllers/Frontend/Checkout.php on line 2192