From ab6a201b2c2e2fa59d1983ebb6d957e5d41fdf22 Mon Sep 17 00:00:00 2001
From: Andrew Nicols <andrew@nicols.co.uk>
Date: Mon, 1 Sep 2025 10:00:13 +0200
Subject: [PATCH] MDL-87046 core: Fix shutdown manager early return

If the `\core_shutdown_manager::initialize` method is called multiple
times, it should only succeed once.

Unfortunately whilst logging existed, the shutdown manager did not
actually exit.
---
 lib/classes/shutdown_manager.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/classes/shutdown_manager.php b/lib/classes/shutdown_manager.php
index 202006c2754..d9072bf5ea2 100644
--- a/lib/classes/shutdown_manager.php
+++ b/lib/classes/shutdown_manager.php
@@ -50,6 +50,7 @@ class core_shutdown_manager {
     public static function initialize() {
         if (self::$registered) {
             debugging('Shutdown manager is already initialised!');
+            return;
         }
         self::$registered = true;
         register_shutdown_function(array('core_shutdown_manager', 'shutdown_handler'));