Hey there, @canadianllama! Thanks for contacting us. I’m happy to help you.
Thank you for the input @rokmeglic, great catch!
To troubleshoot that:
Review JavaScript Code: Look into the JavaScript file referenced in the error message and check the code related to adding products to the cart. Ensure that the product IDs are being retrieved correctly.
Theme/Plugin Conflict: Try switching to a default WordPress theme like Storefront and temporarily deactivate all plugins except WooCommerce. Then, check if the issue persists. This step helps identify if the problem is caused by a theme or plugin conflict. You can find more about this in this guide.
Furthermore, I’d like to understand your site properly. Please share with us the necessary information below for us to investigate the issue further:
System Status Report which you can find via WooCommerce > Status > Get system report > Copy for support.
Fatal error logs (if any) under WooCommerce > Status > Logs.
You could copy and paste your reply here or paste it via https://gist.github.com/ and send the link here.
Have a wonderful day!