problem with admin

Hi, i have a problem with post whith administrative page link,
the erorr are:

Notice: Undefined index: post_type in /data/vhosts/sorsoturismo.it/httpdocs/wp-content/plugins/wp-glossary/class/wpg-post-types.class.php on line 106
{“image”:””,”error”:””,”success”:”Post added, please wait to return to the previous page.”,”post”:1873}

Thank’s for help me

http://wordpress.org/plugins/wp-glossary/