I can solve this problem insert tha follow instruction :
if (isNaN(g)) g = 0;
afer
if (l.prop == "height") { g = (l.now - l.start) / (l.end - l.start); }

so
...
                  step: function(k, l) {
                        if (l.prop == "height") {
                            g = (l.now - l.start) / (l.end - l.start);
                        }
                        if (isNaN(g)) g = 0;
                        j.toShow[0].style[l.prop] = (g * d
[l.prop].value) + d[l.prop].unit;
                    },
...

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