WordPress 5.6 script errors

After upgrading WordPress to v5.6, the following error appears in the browser console:

cartimize-vendor-1.0.0.min.js?ver=5.6:1 [Script Loader] TypeError: Cannot read property 'msie' of undefined
    at eval (eval at e.exports (cartimize-vendor-1.0.0.min.js?ver=5.6:1), <anonymous>:79:15)
    at eval (eval at e.exports (cartimize-vendor-1.0.0.min.js?ver=5.6:1), <anonymous>:121:4)
    at eval (eval at e.exports (cartimize-vendor-1.0.0.min.js?ver=5.6:1), <anonymous>:122:3)
    at eval (<anonymous>)
    at e.exports (cartimize-vendor-1.0.0.min.js?ver=5.6:1)
    at Object.<anonymous> (cartimize-vendor-1.0.0.min.js?ver=5.6:1)
    at t (cartimize-vendor-1.0.0.min.js?ver=5.6:1)
    at Module.<anonymous> (cartimize-vendor-1.0.0.min.js?ver=5.6:1)
    at t (cartimize-vendor-1.0.0.min.js?ver=5.6:1)
    at Object.<anonymous> (cartimize-vendor-1.0.0.min.js?ver=5.6:1)

There are also several instances of the following message (already showing in v5.5):

setNavigator - uri: https://js.stripe.com/v3/elements-inner-card-a2f6cd1867b6bb9c0c125933ec3533bb.html#style[base][iconColor]=%23666EE8&style[base][color]=%2331325F&style[base][fontSize]=15px&style[base][::placeholder][color]=%23CFD7E0&wait=false&rtl=false&componentName=cardCvc&keyMode=live&apiKey=pk_live_7xjbc1htaAsY9DSRdG2GhzzF&origin=https%3A%2F%2Fdev.get-business-online.com&referrer=https%3A%2F%2Fdev.get-business-online.com%2Fbehappyinlife%2Fcheckout%2F%23cartimize-payment-method&controllerId=__privateStripeController9271

The page I need help with: [log in to see the link]