Variable errors in PHP pages

I have upgraded Advanced Poll from v2.0 to v2.0.2. Now PHP gives me errors in all the pages where the poll is included:

Warning: Undefined variable: versionstats in ####/####.php on line 31

PHP gives me "variable error", all the other variables that are in the page are now "undefined". Very strange.

A page where the poll code is included:

http://www.emugenerations.com/reportajes/reviews/review.php?game=cninja

As you can see, there're error in the end of the page (PHP Stats).

Now see this page:

http://www.emugenerations.com/index.php

See the end of the page (PHP Stats). Since there isn't a poll included in the
page, there no errors. Very strange.

Why there're variable errors in the pages where the poll code is included?

very strange

Can the webmaster or someone help?

If I remove only the cookie code (the first line of the page) all works. I think that the problem is with poll_cookie.php. I have used require, require_once ... but it still gives me errors in the other variables in the page.