Looks different in Chrome

[stagos]

Your Portal Version: 1.0.0RC3
Your phpBB Type: Standard phpBB3
MODs installed: No
Your knowledge: Beginner
Boardlink: http://www.team-log.com/

What have you done before the problem was there?
nothing

What have you already tryed to solve the problem?
nothing

Description and Message
hi,
i have installed your mod board portal 3 on my website but it looks different on chrome explorer.
I see this this error : [phpBB Debug] PHP Notice: in file /portal/modules/portal_latest_bots.php on line 84: Undefined index: LAST_VISITED_BOT

i don't see it in firefox or explorer.

Excuse my english.

thx