Uncaught TypeError: Cannot read property 'currentStyle' of null

In my qa pages i got this error:

Uncaught TypeError: Cannot read property ‘currentStyle’ of null plupload.js?ver=1.5.7:2

g.getStyle plupload.js?ver=1.5.7:2

(anonymous function) plupload.html5.js?ver=1.5.7:1

g.extend.trigger plupload.js?ver=1.5.7:2

(anonymous function) plupload.js?ver=1.5.7:2

l.runtimes.Html5.l.addRuntime.init plupload.html5.js?ver=1.5.7:1

v plupload.js?ver=1.5.7:2

g.extend.init plupload.js?ver=1.5.7:2

WPUF_Obj.featImgUploader wpuf.js?ver=3.6:108

WPUF_Obj.init wpuf.js?ver=3.6:14

(anonymous function) wpuf.js?ver=3.6:213

c jquery-1.10.2.js:3048

p.fireWith jquery-1.10.2.js:3160

x.extend.ready jquery-1.10.2.js:433

q

And the page stop loading. I’m using wordpress 3.6