Extension Mailbox

Error in Chrome while deleting an message

Hi I am facing a problem in chrome. While i am going to delete any item after selecting and deleting its not deleting. not even read and unread.

In console its giving error

"Uncaught TypeError: Cannot call method 'attr' of null mailbox.js:303
$.yiimailbox.submitAjax mailbox.js:303
$.yiimailbox.updateMailbox.$.draggable.containment mailbox.js:61
jQuery.event.dispatch jquery.js:3332
jQuery.event.add.elemData.handle.eventHandle"

While the same code is running in firefox and Ie.

don't know why.. Please help me. I am stuck.