From ebb1d8bc600e4ba40a42dab44f16a51be79b000f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Aur=C3=A9lien=20Chretien?=
 <achretien@users.noreply.github.com>
Date: Thu, 20 Jan 2022 09:22:25 +0100
Subject: [PATCH] Fix #19178: Fix null value in unserialize for PHP 8.1
 (#19178)

---
 framework/caching/Cache.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/framework/caching/Cache.php b/framework/caching/Cache.php
index dd2ae4e4caf..6756fc6449c 100644
--- a/framework/caching/Cache.php
+++ b/framework/caching/Cache.php
@@ -135,7 +135,7 @@ public function get($key)
         if ($value === false || $this->serializer === false) {
             return $value;
         } elseif ($this->serializer === null) {
-            $value = unserialize($value);
+            $value = unserialize((string)$value);
         } else {
             $value = call_user_func($this->serializer[1], $value);
         }