Backend search problem

Your function “tr_sku_search_helper” ruins the backend search in woocommerce.

The problem shows itself when ordering by a category from the product list view.
1. Go to wp-admin/edit.php?post_type=product
2. Order by a category from the search.
3. 1 / no results.

We’ve disabled it for the backend by wrapping it in is_admin(), so not a problem for us, but you should fix the code ??