Redirect working inconsistently?

I have this if else script which on 1 instance should redirect, but doesnt, can anybody see why?

if($usersClass->checkTwitterUserExists(
    $_POST['twitterUser'])) {
    print "<br><p>in use.</p>";
}

else {
    #set_include_path("");
    require 'library/Zend/Oauth/Consumer.php';    
    $rs = mysql_query("update `produgg_users` set `twitterUser` =  
        '".mysql_real_escape_string($_POST['twitterUser'])."' where 
        `id` = '".$usersClass->userID()."'") or die(mysql_error());
    $开发者_如何学JAVAconsumer = new Zend_Oauth_Consumer($config);

    // fetch a request token
    $token = $consumer->getRequestToken();
    // persist the token to storage
    $_SESSION['TWITTER_REQUEST_TOKEN'] = serialize($token);
    // redirect the user
    $consumer->redirect();
}    

No closing } (brace) on your if-else conditional.