Ticket #33800: 33800_1.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() )

src/wp-includes/class-wp-user.php

@@ -125 +125 @@
                 if ( $id instanceof WP_User ) {
                         $this->init( $id->data, $blog_id );
                         return;
-                } elseif ( is_object( $id ) ) {
+                } elseif (
+                ( $id ) ) {
                         $this->init( $id, $blog_id );
                         return;
                 }