[Syphin]

I keep getting this error when i change user names:

Warning: Argument to array_reverse() should be an array in /***/***/***/***/***/***/***/member.php on line 459


And this is whats on that line:

PHP Code:

      $DB_site->query("UPDATE user SET username='".addslashes(htmlspecialchars($username))."' WHERE userid='$bbuserinfo[userid]'");
      if ($oldnames=$DB_site->fetch_array($DB_site->query("SELECT * FROM namelogs WHERE userid='$bbuserinfo[userid]'"))) {
        $oldnames = array_reverse($oldnames);
        $oldnames = explode("<~>", $oldnames[usernames]);
        if (count($oldnames) >= 5) {
          $oldestuser = array_shift($oldnames);
          array_splice($oldnames,4,4, addslashes($bbuserinfo[username]));
        }
        else {
          array_push($oldnames,addslashes($bbuserinfo[username]));
        }
        $oldusers = implode($oldnames, "<~>");
        $oldusers = array_reverse($oldusers);   <<**>> LINE 459 <<**>>
        $DB_site->query("UPDATE namelogs SET usernames='".addslashes($oldusers)."',lastchange='".time()."' WHERE userid='$bbuserinfo[userid]'");
      }
      else {
        $DB_site->query("INSERT INTO namelogs (userid, usernames,lastchange) VALUES ('$bbuserinfo[userid]','".addslashes(htmlspecialchars($bbuserinfo[username]))."', '".time()."')");
      }
      $bbuserinfo[username] = $username;
    }
  } 


Any Ideas? =/


-Syphin