Rowspan in <tbody>: Cannot read property 'className' of undefined

I'm using JQuery and DataTable plugin with my tables. So, I need use rowspan in the body of my tables, but a error message is displayed in the console of the chrome: Uncaught TypeError: Cannot read property 'className' of undefined

I read about the fakeRowspan plugin, but I don't know how use it.

See my fiddle with the problem:
http://jsfiddle.net/mayconfsbrito/9mkHz/8/