Fatal error: Uncaught TypeError: Argument 1 passed to Magento\Catalog\Model\ProductRepository::prepareSku() must be of the type string, null given, called in /kunder/parfym_5393/gimlep_7128/public/vendor/magento/module-catalog/Model/ProductRepository.php on line 790 and defined in /kunder/parfym_5393/gimlep_7128/public/vendor/magento/module-catalog/Model/ProductRepository.php:800 Stack trace: #0 /kunder/parfym_5393/gimlep_7128/public/vendor/magento/module-catalog/Model/ProductRepository.php(790): Magento\Catalog\Model\ProductRepository->prepareSku(NULL) #1 /kunder/parfym_5393/gimlep_7128/public/vendor/magento/module-catalog/Model/ProductRepository.php(349): Magento\Catalog\Model\ProductRepository->saveProductInLocalCache(Object(Magento\Catalog\Model\Product\Interceptor), 'adf0bb68589672e...') #2 /kunder/parfym_5393/gimlep_7128/public/vendor/magento/module-catalog/Model/ProductRepository.php(314): Magento\Catalog\Model\ProductRepository->cacheProduct('adf0bb68589672e...', Object(Magento\Catalog\Model\Product\Interceptor)) in /kunder/parfym_5393/gimlep_7128/public/vendor/magento/module-catalog/Model/ProductRepository.php on line 800