PHP notice in error log once a minute

About every sixty seconds the following message is displayed in the error log:


8:24:25 - 06 Nov

User: Public User (7)

Level: PHP Notice

(/php_includes/HTTP/Request.php:1077) - Undefined offset: 1



It's a blue message and I'm assuming it's nothing very bad… but what is it and should I be doing something about it? I had a google around and it seemed to be something to do with arrays not starting with 0 but that doesn't enlighten me much. :huh: