only decorate when an event dispatcher was passed

symfony · Jul 3, 2019 · f19f28a · f19f28a
1 parent 205cd7a
commit f19f28a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/Symfony/Component/Workflow/Workflow.php b/src/Symfony/Component/Workflow/Workflow.php
@@ -43,7 +43,7 @@ public function __construct(Definition $definition, MarkingStoreInterface $marki
     {
         $this->definition = $definition;
         $this->markingStore = $markingStore ?: new MultipleStateMarkingStore();
-        $this->dispatcher = LegacyEventDispatcherProxy::decorate($dispatcher);
+        $this->dispatcher = null !== $dispatcher ? LegacyEventDispatcherProxy::decorate($dispatcher) : null;
         $this->name = $name;
     }