WooCommerce 3.9.1 is now available. This is a minor release that fixes a small bug causing untaxed products to show a 0% tax rate rather than no tax information at all, along with a few other minor fixes.
Please find the full list of updates below:
* Tweak - Trim whitespaces and strip slashes from MaxMind License Key. * Dev - Prevent empty notices to get displayed on frontend. * Fix - Show "-" instead of "0" when tax isn't applicable to a product. * Fix - Fixed fatal error on the thank you page if order is not specified. * REST API - Fixed - Product and variations schema to allow remove sale prices, dimensions and weight.
Download the latest release of WooCommerce here or venture over to Dashboard → Updates to update the plugin from your WordPress admin panel.