apache error log showing PHP notices for ispconfig

[olieb]

Always when I log in to IspConfig my apache error log shows PHP notices:

[Fri date] [error] [client xxxx] PHP Notice:  Undefined index: sites:web_domain:on_after_update in /usr/local/ispconfig/interface/lib/classes/plugin.inc.php on line 140, referer: http://server1 IP:8080/index.php
[Fri date] [error] [client xxxx] PHP Notice:  Undefined index: return_to_url in /usr/local/ispconfig/interface/lib/classes/tform_actions.inc.php on line 142, referer: http://server1 IP:8080/index.php
[Fri date] [notice] Apache/2.2.17 (Ubuntu) DAV/2 mod_fcgid/2.3.6 PHP/5.3.5-1ubuntu7.2 with Suhosin-Patch mod_ruby/1.2.6 Ruby/1.8.7(2010-08-16) mod_ssl/2.2.17 OpenSSL/0.9.8o configured -- resuming normal operations
[Fri date] [error] [client xxxx] PHP Notice:  Undefined index: logout in /usr/local/ispconfig/interface/lib/classes/plugin.inc.php on line 140, referer: http://server1 IP:8080/index.php
[Fri date] [error] [client xxxx] PHP Notice:  Undefined index: site in /usr/local/ispconfig/interface/web/login/logout.php on line 70, referer: http://server1 IP:8080/index.php
[Fri date] [error] [client server1 IP] File does not exist: /var/www/themes
[Fri date] [error] [client server1 IP] File does not exist: /var/www/themes
[Fri date] [error] [client server1 IP] PHP Notice:  Undefined index: login in /usr/local/ispconfig/interface/lib/classes/plugin.inc.php on line 140, referer: http://server1.example.com/ispconfig/
[Fri date] [error] [client server1 IP] PHP Notice:  Undefined variable: html_server in /usr/local/ispconfig/interface/web/monitor/show_sys_state.php on line 237, referer: http://server1.example.com/ispconfig/index.php

More errors are shown but I hope this is sufficient to help me solve it.
Build my server using: http://www.howtoforge.com/perfect-se...04-ispconfig-3
What should I do to prevent these errors?

[till]

Please disable PHP notices by changing the error log leven in the php.ini file and restart apache. The error log level required for ispconfig is:

error_reporting = E_ALL & ~E_NOTICE