Why's this query giving me an error?

[TheMayhem]

Any ideas on what's wrong and a fix?

$DB_site->query("

UPDATE " . TABLE_PREFIX . "user SET

" . $updatestyles . "

WHERE userid = $bbuserinfo[userid]

");


Invalid SQL:
UPDATE user SET
styleid = 14,
WHERE userid = 17690

mysql error: 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 'WHERE userid = 17690' at line 3

[Natch]

the comma at the end of the second line would make that query break: you need to share the code that's generating the variable $updatestyles