nutmix
Just tested the link on Chrome on my ipad, and it worked fine. I did experience the same error yesterday on my own game, and it seemed to occur when I had multiple windows open at once (might be a coincidence). It's possible that Chrome have done an update which conflicted somehow (as I've also noticed there's a few resizing issues on my own game when using Chrome, which weren't there a week or so ago).
Anyway, try running from Chrome after clearing your cache and see if the problem occurs again (I haven't experienced it since)