From ce754447c02d4a7b326e4e2ab7425c8bf51d2def Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Thu, 13 Jul 2023 17:18:52 +0200
Subject: [PATCH] [PropertyAccess] Fix access to undefined "file" key when
 checking stack frames

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

diff --git a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
index a611f2654ef83..1d9ed71d58ee5 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
@@ -470,7 +470,7 @@ private function readProperty(array $zval, string $property, bool $ignoreInvalid
                         [$trace] = $e->getTrace();
 
                         // handle uninitialized properties in PHP >= 7
-                        if (__FILE__ === $trace['file']
+                        if (__FILE__ === ($trace['file'] ?? null)
                             && $name === $trace['function']
                             && $object instanceof $trace['class']
                             && preg_match('/Return value (?:of .*::\w+\(\) )?must be of (?:the )?type (\w+), null returned$/', $e->getMessage(), $matches)