diff --git a/src/Symfony/Component/Cache/Traits/RedisTrait.php b/src/Symfony/Component/Cache/Traits/RedisTrait.php
index 43dbb43639..0276c4fb6d 100644
--- a/src/Symfony/Component/Cache/Traits/RedisTrait.php
+++ b/src/Symfony/Component/Cache/Traits/RedisTrait.php
@@ -156,7 +156,7 @@ trait RedisTrait
 
             $initializer = function ($redis) use ($connect, $params, $dsn, $auth, $hosts) {
                 try {
-                    @$redis->{$connect}($hosts[0]['host'], $hosts[0]['port'], $params['timeout'], (string) $params['persistent_id'], $params['retry_interval']);
+                    @$redis->{$connect}($hosts[0]['host'] ?? $hosts[0]['path'], $hosts[0]['port'] ?? null, $params['timeout'], (string) $params['persistent_id'], $params['retry_interval']);
                 } catch (\RedisException $e) {
                     throw new InvalidArgumentException(sprintf('Redis connection failed (%s): %s', $e->getMessage(), $dsn));
                 }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php
index 77e36e253c..efe1705179 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php
@@ -36,12 +36,15 @@ abstract class DataCollector implements DataCollectorInterface, \Serializable
 
     public function serialize()
     {
-        return serialize($this->data);
+        $trace = debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT, 2);
+        $isCalledFromOverridingMethod = isset($trace[1]['function'], $trace[1]['object']) && 'serialize' === $trace[1]['function'] && $this === $trace[1]['object'];
+
+        return $isCalledFromOverridingMethod ? $this->data : serialize($this->data);
     }
 
     public function unserialize($data)
     {
-        $this->data = unserialize($data);
+        $this->data = \is_array($data) ? $data : unserialize($data);
     }
 
     /**