Color contrast checker seems to be broken

[aberkow]

We were checking some possible color combinations for a project and created a test site with a few button elements. When I went to check them with tota11y, it only seems to check the first button. It does check other elements (such as a group of links). Honestly I'm not sure I can describe the issue in more detail. There's one error in the console that comes up.

Uncaught TypeError: Cannot read property 'position' of undefined
    at HTMLDivElement.<anonymous> (tota11y.min.js:formatted:4352)
    at tota11y.min.js:formatted:788
    at Function.map (tota11y.min.js:formatted:918)
    at ue.fn.init.map (tota11y.min.js:formatted:787)
    at tota11y.min.js:formatted:4351
    at dispatch (tota11y.min.js:formatted:2479)
    at m.handle (tota11y.min.js:formatted:2412)

Here are some screenshots I took as well.

Not working

Working