My videos are unlisted - I embed them on my website but do not make them publicly available through my Vimeo channel. The link you provided is a public video. Unlisted videos have a 2-part URL as I've provided. When I made one of my videos public, It converts to a 1-part URL.
In short, your JS is truncating off part of the 2-part URL and leaving the renderer with an invalid URL. It is a simple fix, I think, to correct this to handle both public and unlisted URLs.
We've been going around on this for a couple of weeks, 1 day at a time due to the time difference between California where I am and your support staff. Please let me know how/when this can be resolved.