[Plugin: Blog Introduction] Undefined variable: page_name

Hi!

After using the WP-Debug-Feature, i see the message:

Notice: Undefined variable: page_name in /is/htdocs/wp11011785_43C5XT2RQT/www/wp/wp-content/plugins/blog-introduction/blog-introduction.php on line 116

Notice: Undefined variable: page_name in /is/htdocs/wp11011785_43C5XT2RQT/www/wp/wp-content/plugins/blog-introduction/blog-introduction.php on line 123

Whats wrong there?

http://wordpress.org/extend/plugins/blog-introduction/