diff --git a/wp-includes/user.php b/wp-includes/user.php
index 700a758990..d078d3d0f8 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -3106,7 +3106,7 @@ function check_password_reset_key( $key, $login ) {
  *                           Defaults to `$_POST['user_login']` if not set.
  * @return true|WP_Error True when finished, WP_Error object on error.
  */
-function retrieve_password( $user_login = null ) {
+function retrieve_password( $user_login = '' ) {
 	$errors    = new WP_Error();
 	$user_data = false;
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5b0cbec2c5..61980eb1c3 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.8-alpha-59307';
+$wp_version = '6.8-alpha-59312';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.