From 4a9d6a547539f5b27832603bf62288957fa70b9b Mon Sep 17 00:00:00 2001
From: Christian Flothmann <christian.flothmann@qossmic.com>
Date: Wed, 1 Jun 2022 15:42:50 +0200
Subject: [PATCH] [Cache] do not pass null to strlen()

---
 src/Symfony/Component/Cache/Traits/RedisTrait.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Symfony/Component/Cache/Traits/RedisTrait.php b/src/Symfony/Component/Cache/Traits/RedisTrait.php
index c27e0df689493..dabdde4e705ce 100644
--- a/src/Symfony/Component/Cache/Traits/RedisTrait.php
+++ b/src/Symfony/Component/Cache/Traits/RedisTrait.php
@@ -373,7 +373,7 @@ protected function doClear($namespace)
     {
         if ($this->redis instanceof \Predis\ClientInterface) {
             $prefix = $this->redis->getOptions()->prefix ? $this->redis->getOptions()->prefix->getPrefix() : '';
-            $prefixLen = \strlen($prefix);
+            $prefixLen = \strlen($prefix ?? '');
         }
 
         $cleared = true;