Treedoc type throws on erasing

[legastero]

Erasing all of the text from a treedoc/treedoc-text throws an exception:

Uncaught (in promise) TypeError: Cannot read property '1' of undefined
    at sliceAndRemove (treedoc.js:306)
    at remove (treedoc.js:160)
    at walkDepthFirst (treedoc.js:180)
    at walkDepthFirst (treedoc.js:346)
    at Array.removeAt (treedoc.js:164)
    at Promise (type.js:177)
    at new Promise (<anonymous>)
    at EventEmitter._args [as removeAt] (type.js:175)
    at setInterval (index.js:67)