getResources глюк при рекурсии или что?

if($cacheManager = $modx->getCacheManager()) {
	$key = md5('heme::getTopCategory:num:'.$input);
	if ($out = $cacheManager->get($key)) {
		return $out;
	}else{
		$inCache = false;
	}
}
$query = $modx->newQuery('modResource');
$query->where(array(
  'parent' => $input,
));
$query->sortby('pub_date','ASC');
$query->limit(4);
$docs = $modx->getIterator('modResource',$query);
$out ='';
foreach ($docs as $doc) {
    $docArray = $doc->toArray();
    $out .= $modx->getChunk('myChank',$docArray);
}

if (is_object($cacheManager) && !$inCache) $cacheManager->set($key, $out, 7200);
/* this caches the data for 2 hours. */
return $out;