diff --git a/wp-includes/class-wp-walker.php b/wp-includes/class-wp-walker.php
index 13c0b23429..c76451cd94 100644
--- a/wp-includes/class-wp-walker.php
+++ b/wp-includes/class-wp-walker.php
@@ -342,7 +342,7 @@ class Walker {
 		$top_level_elements = array();
 		$children_elements  = array();
 		foreach ( $elements as $e ) {
-			if ( 0 == $e->$parent_field ) {
+			if ( empty( $e->$parent_field ) ) {
 				$top_level_elements[] = $e;
 			} else {
 				$children_elements[ $e->$parent_field ][] = $e;
@@ -412,7 +412,7 @@ class Walker {
 		$parent_field = $this->db_fields['parent'];
 
 		foreach ( $elements as $e ) {
-			if ( 0 == $e->$parent_field ) {
+			if ( empty( $e->$parent_field ) ) {
 				$num++;
 			}
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0bf23f7b33..7108295a72 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-beta2-51203';
+$wp_version = '5.8-beta2-51204';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.