Fatal error: Uncaught TypeError: Argument 1 passed to Shopware\Components\Compatibility\LegacyStructConverter::convertProductStruct() must be an instance of Shopware\Bundle\StoreFrontBundle\Struct\Product, null given, called in /var/customers/webs/brockhaus/schreibgefuehl/custom/plugins/KilbGreetingCards/Services/ArticleService.php on line 125 and defined in /var/customers/webs/brockhaus/schreibgefuehl/engine/Shopware/Components/Compatibility/LegacyStructConverter.php:426 Stack trace: #0 /var/customers/webs/brockhaus/schreibgefuehl/custom/plugins/KilbGreetingCards/Services/ArticleService.php(125): Shopware\Components\Compatibility\LegacyStructConverter->convertProductStruct() #1 /var/customers/webs/brockhaus/schreibgefuehl/custom/plugins/KilbGreetingCards/Controllers/Frontend/KilbGreetingCards.php(75): KilbGreetingCards\Services\ArticleService->getGreetingCardByNumber() #2 /var/customers/webs/brockhaus/schreibgefuehl/engine/Library/Enlight/Controller/Action.php(188): Shopware_Controllers_Frontend_KilbGreetingCards->addTex in /var/customers/webs/brockhaus/schreibgefuehl/engine/Shopware/Components/Compatibility/LegacyStructConverter.php on line 426