Woocommerce - getting a 'Please choose product options by visiting..' error on checkout page

Hi

On one of our sites - bradfordwalking.org. We’ve recently started getting this error message on the checkout.

When you are on the checkout page, and select a payment option, the error message appears at the top of the page.

It seems to be since we updated from 6.8.5 after getting that critical error on all our sites a few weeks ago. Currently all themes and plugins are up to date.

It’s a variable product that has options for Walk Date and Pickup Location. Both are selected before it lets you add to cart.

From testing, I deactivated all plugins on the site other than the core woocommerce plugin and it still happens. Changing the theme over to the default 2025 theme stops it from happening.

I’ve also discovered that if you wipe all cookies and cache for the site, it works fine until you delete a product from your basket. After this, adding another product to the basket results in the error message coming back once you select a payment option again on the checkout page.

I followed a bunch of tests suggested by woocommerce support and they said to check for javascript errors on the page and I’m getting the following if any is relevant…

But I’m still getting errors in the default 2025 theme…

And a second check back in Pro gave less errors…

We’re not getting this on any of our other woocommerce sites but none of those use variable products.

Any ideas?