Ticket #33800: 33800_2.diff

src/wp-admin/includes/user.php

@@ -273 +273 @@
 function wp_delete_user( $id, $reassign = null ) {
         global $wpdb;
 
-        $id = (int) $id;
+        if ( ! is_numeric( $id ) && ! $id instanceof WP_User  ){
+                return false;
+        }
+
         $user = new WP_User( $id );
 
         if ( !$user->exists() )