From f19f28a41d62acf89f11ad077550ebb38767aad6 Mon Sep 17 00:00:00 2001
From: Christian Flothmann <christian.flothmann@sensiolabs.de>
Date: Wed, 3 Jul 2019 09:52:02 +0200
Subject: [PATCH] only decorate when an event dispatcher was passed

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

diff --git a/src/Symfony/Component/Workflow/Workflow.php b/src/Symfony/Component/Workflow/Workflow.php
index e3df8cb0d0..76e53eda51 100644
--- a/src/Symfony/Component/Workflow/Workflow.php
+++ b/src/Symfony/Component/Workflow/Workflow.php
@@ -43,7 +43,7 @@ class Workflow implements WorkflowInterface
     {
         $this->definition = $definition;
         $this->markingStore = $markingStore ?: new MultipleStateMarkingStore();
-        $this->dispatcher = LegacyEventDispatcherProxy::decorate($dispatcher);
+        $this->dispatcher = null !== $dispatcher ? LegacyEventDispatcherProxy::decorate($dispatcher) : null;
         $this->name = $name;
     }