From a28e253fe6944f5768088c1b77ac40a91c721c4b Mon Sep 17 00:00:00 2001
From: Markus Staab <47448731+clxmstaab@users.noreply.github.com>
Date: Tue, 7 Oct 2025 15:57:16 +0200
Subject: [PATCH] Fix "Possibly invalid array key type string|null."

---
 src/Symfony/XmlServiceMapFactory.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Symfony/XmlServiceMapFactory.php b/src/Symfony/XmlServiceMapFactory.php
index ac79cb30..41365e14 100644
--- a/src/Symfony/XmlServiceMapFactory.php
+++ b/src/Symfony/XmlServiceMapFactory.php
@@ -77,7 +77,7 @@ public function create(): ServiceMap
 		}
 		foreach ($aliases as $service) {
 			$alias = $service->getAlias();
-			if ($alias !== null && !isset($services[$alias])) {
+			if ($alias === null || !isset($services[$alias])) {
 				continue;
 			}
 			$id = $service->getId();