While I'm not directly affected by this, a blank white page is always a symptom of careless error handling, even in the case where the user has JS turned off. The <noscript> tag exists expressly to present information about your site's need to have JS enabled

Yes

We've tested it on the latest version of Safari. Maybe try on an updated browser?

It's totally up to date. From the console:

"TypeError: N.at is not a function. (In 'N.at(-1)', 'N.at' is undefined)"

I get the same error in latest Safari.