Author: H.User1325 (12 Feb 13 11:25am)
I try not to comment on things I don't know anything about, but ...
Looks to me like there is a PHP programming error in an application named honeypot.php
In case you don't know "PHP Notice:" in your error log is not Project Honey Pot but PHP a server-side scripting Hypertext language.
(here is where the "know nothing about" come in)
I am guessing that you are running a program, forum, blog, what ever, that has implemented a call to http:BL to block spammers from adding comment spam to you forum. It looks, to me, like that has been implemented with a php script file named honeypot.php
Further out on the same limb ~ If I were looking for the error "Undefined offset: 1" looks like an error I have seen when a array is accessed incorrectly. Anyway that is what I would look for around line 328 of that program file.