bug in 1.9.2 ?

After updating to 1.9.2 from 1.8.0 I get an error when accessing wp-admin

Fatal error: Call to undefined function insert_with_markers() in /customers/b/a/6/dclasersystem.com/httpd.www/wp-content/plugins/http-headers/http-headers.php on line 1044

Somehow the function insert_with_markers is not accessible.

If I downgrade to 1.8.0 then everything works!

PS! Thanks for a very good plugin!