diff --git a/wp-includes/class-wp-rewrite.php b/wp-includes/class-wp-rewrite.php
index f7f4468f54..bc96c083dc 100644
--- a/wp-includes/class-wp-rewrite.php
+++ b/wp-includes/class-wp-rewrite.php
@@ -1684,7 +1684,7 @@ class WP_Rewrite {
 		global $wp;
 
 		// For backward compatibility, if null has explicitly been passed as `$query_var`, assume `true`.
-		if ( true === $query_var || null === func_get_arg( 2 ) ) {
+		if ( true === $query_var || null === $query_var ) {
 			$query_var = $name;
 		}
 		$this->endpoints[] = array( $places, $name, $query_var );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index f03dcc7e79..b4203b2413 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46140';
+$wp_version = '5.3-alpha-46141';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.