Почему window.History.pushState is not a function?

JCSmartFilter.prototype.filterCatalog = function(t, e) {
    window.History.enabled || null != window.history.pushState ? window.History.pushState(null, document.title, t) : location.href = t,

m.pushState = function(b, c, d, e) {
                if (m.getHashByUrl(d) && m.emulated.pushState)
                    throw new Error("History.js does not support states with fragement-identifiers (hashes/anchors).");
                if (e !== !1 && m.busy())
                    return m.pushQueue({
                        scope: m,
                        callback: m.pushState,
                        args: arguments,
                        queue: e
                    }),
                    !1;
                m.busy(!0);
                var f = m.createStateObject(b, c, d);
                return m.isLastSavedState(f) ? m.busy(!1) : (m.storeState(f),
                m.expectedStateId = f.id,
                n.pushState(f.id, f.title, f.url),
                m.Adapter.trigger(a, "popstate")),
                !0
            }