_this._isExtraActive is null in function Slider(container, config) {

[Alex_Neblett]

Please look at

var element = (_a = _this.getRootView().refs[_this._isExtraActive ? “extraRunner” : “runner”]) === null || _a === void 0 ? void 0 : _a.el;

Sometimes, _this._isExtraActive is null.

Cheers,

Alex