Help! Lavalair Chat.php Error

[anthrax68]

I'm getting this error. After clicking "Say" per message. You have an error in your SQL syntax;
check the manual that corresponds to
your MySQL server version for the right
syntax to use near '' at line 5,
I think the error is in (USERNAME: message) . I mod it but I got error

[something else]

line 5 isnt anything to do with mysql so that must be a different page the error is on?