Notice: Trying to get property of non-object in line 11

Notice: Trying to get property of non-object in line 11

How to resolve the error
'Notice: Trying to get property of non-object in line 11' in folowing code:
<?php
$doc = new DOMDocument();
$doc-
>load('http://www.softarea51.com/rss/windows/Web_Development/XML_CSS_Utilities.xml');
$arrFeeds = array();
foreach ($doc->getElementsByTagName('item') as $node)
{
$itemRSS = array (
'title' => $node->getElementsByTagName('title')->item(0)->nodeValue,
'desc' =>
$node->getElementsByTagName('description')->item(0)->nodeValue,
'link' => $node->getElementsByTagName('link')->item(0)->nodeValue,
'date' => $node->getElementsByTagName('pubDate')->item(0)->nodeValue
);
array_push($arrFeeds, $itemRSS);
}
?>