Some help please?

[Chris M]

I keep getting a database error whenever I try to update a user...

Can someone tell me what is wrong with this line?

PHP Code:

    if ($exists=$DB_site->query_first("SELECT userid FROM user WHERE username=".addslashes(htmlspecialchars($ausername))." AND userid <> $userid")) {
        echo "There is already an ".makelinkcode('user',"user.php?do=edit&userid=$exists[userid]",1)." named <b>".htmlspecialchars($ausername)."</b>";
        exit;
    } 


It keeps causing an error, and I dont know why...

Also - Our member numbers jumped from "386" or thereabouts, to something like "12123134"...

Could that be the cause of the error, and if so, how can I change it?

Satan