[jQuery] JQuery tablesorter problem

I am facing problem with jquery.tablesorter.js

It's working fine if I have more than column in sorting/header list.

But if I have one column in sorting/header showing following error.

o is undefined
o.order = o.count = s[1]; (jquery.tablesorter.js at line 421)

Please suggest me fix for this

Regards
Nagaraju P