simplepie: check whether enclosures array is defined before parsing

functions.php

@@ -919,12 +919,14 @@
 				if (ENABLE_SIMPLEPIE) {
 					$encs = $item->get_enclosures();
 
+					if (is_array($encs)) {
 						foreach ($encs as $e) {
 							$e_item = array(
 								$e->link, $e->type, $e->length);
 	
 							array_push($enclosures, $e_item);
 						}
+					}
 
 				} else {
 					$e_ctr = $item['enclosure#'];