Archives Error: Displays “0” as a Month

Hi,

My blog is at http://nerdnirvana.org/

Notice that on the sidebar, under Archives, I have a “0” listed as one of the months. The weird thing about this is that the “0” and its link depends on the month. That means on April, it will lead to /2006/04/.

Does anyone know what’s wrong? If so, how can I fix this problem.

Thanks!