Cannot read property '1' of undefined

[Bulala-liu]

It occurred in using rc-color-picker accidently.
Error tracker positioned the error source code:
He.prototype.__iterate = function(e, t) { var n = this , r = 0; return this._root && this._root.iterate((function(t) { return r++, e(t[1], t[0], n) } ), t), r }
Need Help.