Woocommerce Stripe Java Script Issue

I activated the Woocommerce Stripe Gateway on my site https://partybag.ie at the start of this year. No problems with 90-95% of online orders, but the other customers seem to all run into a similar java script error which stops them submitting the payment online.

I’ve called these customers and (the ones that were willing) they were able to complete their sale over the phone via my Stripe account.

I know the sale that failed earlier today was on a Mac – don’t know what other customers were using.

I’m using the up to date Storefront theme 2.1.8.

I tried contacting Stripe first, but they are saying that it seems to be an integration issue with the plugin.

Can anyone help here? I’m not a technical person – so any non-coding solutions welcome