JS error since upgrade to version 3.5.2 and WP 5.3

Hello,

Search for “modal-link” in the above page code to see which link needs to be opened with your plugin. You’ll see it triggers a JS error and link just opens normally, not in modal.
It used to work fine before so not sure if it the latest WP update or plugin that’s in cause.

Could you do something? Am I missing something?

Thanks!

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