Fatal error: Uncaught TypeError: Argument 1 passed to Magento\Catalog\Model\ProductRepository::prepareSku() must be of the type string, null given, called in /var/www/vhosts/xcelsitas.com/neew_live/vendor/magento/module-catalog/Model/ProductRepository.php on line 856 and defined in /var/www/vhosts/xcelsitas.com/neew_live/vendor/magento/module-catalog/Model/ProductRepository.php:866 Stack trace: #0 /var/www/vhosts/xcelsitas.com/neew_live/vendor/magento/module-catalog/Model/ProductRepository.php(856): Magento\Catalog\Model\ProductRepository->prepareSku(NULL) #1 /var/www/vhosts/xcelsitas.com/neew_live/vendor/magento/module-catalog/Model/ProductRepository.php(329): Magento\Catalog\Model\ProductRepository->saveProductInLocalCache(Object(Magento\Catalog\Model\Product\Interceptor), '70f219631131d9b...') #2 /var/www/vhosts/xcelsitas.com/neew_live/vendor/magento/module-catalog/Model/ProductRepository.php(294): Magento\Catalog\Model\ProductRepository->cacheProduct('70f219631131d9b...', Object(Magento\Catalog\Model\Product\Intercept in /var/www/vhosts/xcelsitas.com/neew_live/vendor/magento/module-catalog/Model/ProductRepository.php on line 866