chained transform not work on chrome

[ilkr]

function animate() {
       $("#ball").animate({ 'margin-top': "-160px", 'rotate': '+=180deg' }, "slow", "swing");
       $("#ball").animate({ 'margin-top': "-20px", 'rotate': '+=180deg' }, "slow", "easeOutBounce");
}

this transform works well on firefox and safari but stop after first step on chrome

and i get error on chrome

Uncaught TypeError: Cannot read property '1' of null c.extend.getAttr/.../main/js/jquery.transform-0.8.0.min.js:9 e.fx.cur/.../main/js/jquery.transform-0.8.0.min.js:9 c.fn.extend.animate/.../main/js/jquery-1.4.3.min.js:148 c.b.extend.each/.../main/js/jquery-1.4.3.min.js:32 c.fn.extend.animate/.../main/js/jquery-1.4.3.min.js:148 c.extend.dequeue/.../main/js/jquery-1.4.3.min.js:46 c.fn.extend.dequeue/.../main/js/jquery-1.4.3.min.js:46 c.b.extend.each/.../main/js/jquery-1.4.3.min.js:32 c.b.fn.b.each/.../main/js/jquery-1.4.3.min.js:26 c.fn.extend.dequeue/.../main/js/jquery-1.4.3.min.js:46 c.extend.speed.e.complete/.../main/js/jquery-1.4.3.min.js:150 c.fx.step/.../main/js/jquery-1.4.3.min.js:154 e/.../main/js/jquery-1.4.3.min.js:151 c.extend.tick