Error in iPhone <= 6

[tomyinhauser]

Devices: iPhone 6 Plus (or less)
Browsers: Safari / Chrome
Tested using www.browserstack.com

Issue:
The component renders, but when trying to navigate through it, a Javascript error occurs:
TypeError: undefined is not an object (evaluating 'o.match')

How to reproduce:
Although I have tested it in my own webpage, the same error occurs in the demo page: https://www.webcomponents.org/element/Redbility/paper-carousel

Additional comments:
It works properly on iPhone 6S and above.