A blank SKU breaks inventory, support, and feeds.
WooCommerce does not require a SKU. Blank SKUs then collide with imports, packing, and Shopping identifiers. Catalog Audit lists every product with a missing SKU.
Free on WordPress.org Duplicate SKU is Pro
Missing SKU is a free check. Duplicate SKU is Pro. Scans stay on your site. We do not overwrite a SKU that already exists.
What to do
- Install Catalog Audit. Open WooCommerce → Catalog Audit → missing SKU.
- Give each product a unique SKU. Do not copy a variation SKU onto the parent.
- If you want someone else to fill blanks from a rule you approve, that is Fix-It (from $299, staging only).