WordPress SEO Yoast, class-frontend.php on line 555

Hello, the issue is for the plugin WordPress SEO by Yoast (Version 1.1.2).
I just updated a client’s website to wordpress 3.3.1 and after doing this, the archives page from the website gives me the following error:

Fatal error: Using $this when not in object context in /home/sprintme/public_html/wp-content/plugins/wordpress-seo/frontend/class-frontend.php on line 555

My client’s website, when I get the error is: https://www.sprintmedia.ca/2012/01/ or any other archive’s page. The other pages are working correctly.

What is in line 555 is : } else if ( $this->is_home_posts_page() && isset($options['metadesc-home']) ) {

Please help me with this issue, and thank you!