I hope that you are doing great. Apologies for the delayed response.
I think there is a plugin conflict/compatibility issue.
Please kindly do a plugin compatibility check by doing these steps to identify the error :
=> Deactivate your additional plugins except WooCommerce and PVT – Product Variation Table for WooCommerce Plugin.
=> See if the problem persists. If the issue is resolved, you can tell which plugin might be the culprit of this error by activating your additional plugins individually.
If you still have the issue with all the plugins deactivated, please switch to the parent theme. The issue can arise from customizations added to the child theme too.
Ramsy Dahla