Feedparser: Add important check for unknown feed type detection
@@ -93,7 +93,7 @@ class FeedParser {
$root = $xpath->query("(//atom03:feed|//atom:feed|//channel|//rdf:rdf|//rdf:RDF)");
- if ($root) {
+ if ($root && $root->length > 0) {
$root = $root->item(0);
if ($root) {