IE9 error

I’m seeing this when testing in IE9 on blog.octanenation.com:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)
Timestamp: Fri, 30 Nov 2012 05:36:28 UTC

Message: Object required
Line: 8
Char: 374
Code: 0
URI: http://widgets.digg.com/buttons.js

Any idea on how to fix this?

http://ww.wp.xz.cn/extend/plugins/digg-digg/