Try Catch?

Fatal error: Call to a member function getAttribute() on a non-object in C:\www\modcast\updater\updateitem.php on line 37

Fatal error: Call to a member function getAttribute() on a non-object in C:\www\modcast\updater\updateitem.php on line 37

$enclosure_url = addslashes($element_item_enclosure->item($a)->getAttribute('url'));

$enclosure_url = addslashes($element_item_enclosure->item($a)->getAttribute('url'));

try
{
	$enclosure_url = addslashes($element_item_enclosure->item($a)->getAttribute('url'));
}
	catch (Exception $e)
{
	echo "Error: $e";
}

try
{
	$enclosure_url = addslashes($element_item_enclosure->item($a)->getAttribute('url'));
}
	catch (Exception $e)
{
	echo "Error: $e";
}