Index: src/wp-includes/canonical.php
===================================================================
--- src/wp-includes/canonical.php	(revisione 41249)
+++ src/wp-includes/canonical.php	(copia locale)
@@ -568,7 +568,9 @@
 		if ( ! empty( $parsed_url['port'] ) ) {
 			$url .= ':' . $parsed_url['port'];
 		}
-		$url .= $parsed_url['path'];
+		if ( ! empty( $parsed_url['path'] ) ) {
+			$url .= $parsed_url['path'];
+		}
 		if ( ! empty( $parsed_url['query'] ) ) {
 			$url .= '?' . $parsed_url['query'];
 		}