unadopt is not defined

[BlackMath]

If I create a second mathBox having already created one, I get this:

Uncaught ReferenceError: unadopt is not defined
    at Slide.unmake (mathbox-bundle.js:62371)
    at Slide.Primitive._removed (mathbox-bundle.js:55606)
    at Group.<anonymous> (mathbox-bundle.js:55520)
    at Group._trigger (mathbox-bundle.js:72464)
    at Group.Node._removed (mathbox-bundle.js:55103)
    at Group.remove (mathbox-bundle.js:54480)
    at Controller.remove (mathbox-bundle.js:72262)
    at API.remove (mathbox-bundle.js:71959)
    at API.remove (mathbox-bundle.js:71954)