After upgrade towards Slackware 12.0 the following error appears in the webserver logfile :
[Sat Mar 29 19:37:15 2008] [error] [client 192.168.1.16] PHP Notice: Undefined index: info in /var/www/htdocs/zussaweb/frontend.php on line 73, referer: http://192.168.1.1/zussaweb/index.php