Bootstrap.inc entries in error_log

Hi,

I'm getting repeated entries in error_log in my root folder relating to Bootstrap.inc

[09-Oct-2013 00:00:05 Europe/Helsinki] PHP Notice: Undefined index: SCRIPT_NAME in /home/XXX/public_html/includes/bootstrap.inc on line 1608
[09-Oct-2013 00:00:05 Europe/Helsinki] PHP Notice: Undefined index: REMOTE_ADDR in /home/XXX/public_html/includes/bootstrap.inc on line 2835

They happen every day and only seem to happen in the few seconds after midnight.

Searching didn't produces any similar matches or than a CRON job suggestion.

My CRON looks like this

cd /home/XXX/public_html; php /home/XXX/public_html/cron.php > /dev/null

with 1 for the hour * for everything else

Any idea?

PHP Version 5.4.19
Drupal 7.22

Thanks