[Plugin: WP-PageNavi] newsid in url

Hello world!

I’m using the latest version of wp-pagenavi (2.82) and for some 2-3 weeks I started to see a lot of 404 errors in google webmaster tools. They look like http://mysite.com/page/180/?newsid=2110.

I’ve somehow managed to fix the 404 error (the page is accessible) but I’d really like to know why this happens and how can I stop it. All the pages linked from that page have ?newsid in their urls, too.

http://wordpress.org/extend/plugins/wp-pagenavi/