public function aroundUpdateStockItemBySku(
        \Magento\CatalogInventory\Model\StockRegistry $subject,
        \Closure $proceed,
        $productSku,
        \Magento\CatalogInventory\Api\Data\StockItemInterface $stockItem
    ) {
        $result = null;
        $stockId = $stockItem->getStockId();
        if ($stockId) {
            $result = $proceed($productSku, $stockItem);
        }
        return $result;
    }