Hi loai,
Thank you for reaching out to us. Please kindly do a plugin compatibility check by doing these steps to identify the error :
=> Deactivate all your additional plugins except WooCommerce and WooCommerce Variation Swatches Plugin.
=> See if the problem persists. If the problem is resolved, you can tell which plugin might be the culprit of this error by activating your additional plugins one by one.
I am looking forward to hearing from you soon.
Thank you
ariations on the phone screen
loai sharkeiah