diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 7127f145cc..b07ecb7f4d 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -907,7 +907,7 @@ function do_enclose( $content = null, $post ) {
 
 				// Check to see if we can figure out the mime type from the extension.
 				$url_parts = parse_url( $url );
-				if ( false !== $url_parts ) {
+				if ( false !== $url_parts && ! empty( $url_parts['path'] ) ) {
 					$extension = pathinfo( $url_parts['path'], PATHINFO_EXTENSION );
 					if ( ! empty( $extension ) ) {
 						foreach ( wp_get_mime_types() as $exts => $mime ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3a14dedeef..3557919ba6 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-beta3-48620';
+$wp_version = '5.5-beta3-48621';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.