diff --git a/wp-includes/pluggable.php b/wp-includes/pluggable.php
index 51701e787e..5ed63e539c 100644
--- a/wp-includes/pluggable.php
+++ b/wp-includes/pluggable.php
@@ -617,7 +617,7 @@ if ( ! function_exists( 'wp_authenticate' ) ) :
 		 */
 		$user = apply_filters( 'authenticate', null, $username, $password );
 
-		if ( null === $user ) {
+		if ( null === $user || false === $user ) {
 			/*
 			 * TODO: What should the error message be? (Or would these even happen?)
 			 * Only needed if all authentication handlers fail to return anything.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 24aa8e9659..e6fcc51c8e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-57989';
+$wp_version = '6.6-alpha-57990';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.