From 22e9e847ad4acb5908f4d96d7a08a305270abeca Mon Sep 17 00:00:00 2001
From: catch <6915-catch@users.noreply.drupalcode.org>
Date: Mon, 18 Nov 2024 17:30:26 +0000
Subject: [PATCH] Issue #3485296 by bradjones1, alexpott, emptyvoid, longwave,
 sidgrafix, dmitry.korhov: Regression: Deprecation of `yaml_parser_class`
 setting in 10.3 breaks sites < 11.0

---
 core/lib/Drupal/Core/Serialization/Yaml.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/lib/Drupal/Core/Serialization/Yaml.php b/core/lib/Drupal/Core/Serialization/Yaml.php
index 6e7b37cf7a8..b17b57302b9 100644
--- a/core/lib/Drupal/Core/Serialization/Yaml.php
+++ b/core/lib/Drupal/Core/Serialization/Yaml.php
@@ -13,7 +13,8 @@ use Drupal\Component\Serialization\Yaml as ComponentYaml;
 class Yaml extends ComponentYaml {
 
   public static function decode($raw) {
-    if ($class = Settings::get('yaml_parser_class')) {
+    $class = Settings::get('yaml_parser_class');
+    if ($class && $class !== TRUE) {
       return $class::decode($raw);
     }