Problem while saving

Hey guys,

i am new to cakephp and fail at saving data. I got a model Profile
which contains many user-profile information. In one action i want to
rate the profile using ajax and save the rating to the database:
(unrelated stuff commented)

function rate($id = null, $points=null) {
// Configure::write('debug', 0);
// $this->autoRender = false;
// $this->disableCache();
// $this->RequestHandler->setContent('json', 'text/x-json');
// if ($this->RequestHandler->isAjax()) {
// if ( $this->Profile->exists($id) && preg_match('#^[0-9]+
$#',$points) && (int)$points >=1 && (int)$points <= 10 ) {
// $canVote = $this->Profile->Rating->canVote($id);
// if ($canVote) {
$profile = $this->Profile->read(null, $id);

$saveData = array('Profile' => array());
$saveData['Profile']['rating'] =
$profile['Profile']['rating'] + $points;
$saveData['Profile']['raters'] =
$profile['Profile']['raters'] + 1;
$saveData['Profile']['avgrating'] =
$saveData['Profile']['rating']/$saveData['Profile']['raters'];

var_dump($this->Profile->save($saveData));

// $this->Profile->Rating->create();
// $this->Profile->Rating->set('ip',
$_SERVER['REMOTE_ADDR']);
// $this->Profile->Rating->set('profile_id', $id);
// $this->Profile->Rating->save();

$jsonData = $saveData['Profile'];

echo json_encode($jsonData);
exit(0);
// }
// }
// }
// echo '0';
// exit(0);
}

Well if i call this page in browser, the output is:

bool(false) {"rating":20,"raters":4,"avgrating":5}

Obviously the saving failed, but why?
The Profile model has no validation rules for the fields used here,
however it has rules for other fields...

If i use something like this:
$this->Profile->saveField('raters', $this->Profile->field('raters') +
1 );
it works but causes too many mysql querys :(

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