From c4a3b9619977d347a87f3a7bf04c0add7f1105d5 Mon Sep 17 00:00:00 2001
From: allflame <allflame@syneforge.com>
Date: Fri, 30 Nov 2018 13:10:45 +0200
Subject: [PATCH] Do not process cache aliases that are not present in the
 container

---
 .../DependencyInjection/FrameworkExtension.php               | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index f4b20ee92d0a7..6f8607ba5879c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -1635,7 +1635,10 @@ private function registerCacheConfiguration(array $config, ContainerBuilder $con
         }
         foreach (array('doctrine', 'psr6', 'redis', 'memcached', 'pdo') as $name) {
             if (isset($config[$name = 'default_'.$name.'_provider'])) {
-                $container->setAlias('cache.'.$name, new Alias(CachePoolPass::getServiceProvider($container, $config[$name]), false));
+                if (!$container->hasDefinition($alias = CachePoolPass::getServiceProvider($container, $config[$name]))) {
+                    continue;
+                }
+                $container->setAlias('cache.'.$name, new Alias($alias, false));
             }
         }
         foreach (array('app', 'system') as $name) {