I’ve temporary disabled MailChimp for WooCommerce plugin and this solves the problem.
This problem appears in the console http://prntscr.com/k4qs4c If you did not edit this js file, it would be better to contact the plugin author about this problem.
Also, in our documentation, we recommend using MailChimp for WordPress plugin https://www.8theme.com/demo/docs/royal/#0_newsletters so you can try to use this plugin.
Regards