I've tried chrome dev tools switched to iphone 5 screen user agent and resolution, but I don't get the errors on the console on that url. I don't have an iphone with me right now so I can't look with that, and even if I had, I couldn't be able to see the iPhone error console as I'm not using a Mac computer.
I also tried ipad, ipad mini and iPhone 6 resolutions, but there are no errors.
I have no idea why is it happening to you.Best,
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