From de41002f28436dcc8b555e9ae48032bf848d19c8 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Thu, 17 Sep 2015 11:14:05 +0100
Subject: [PATCH] Fix potential access to undefined index

---
 src/Symfony/Component/EventDispatcher/EventDispatcher.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Symfony/Component/EventDispatcher/EventDispatcher.php b/src/Symfony/Component/EventDispatcher/EventDispatcher.php
index e3d587939f..9f4a4ecf00 100644
--- a/src/Symfony/Component/EventDispatcher/EventDispatcher.php
+++ b/src/Symfony/Component/EventDispatcher/EventDispatcher.php
@@ -61,7 +61,11 @@ class EventDispatcher implements EventDispatcherInterface
     public function getListeners($eventName = null, $withPriorities = false)
     {
         if (true === $withPriorities) {
-            return $eventName ? $this->listeners[$eventName] : array_filter($this->listeners);
+            if (null !== $eventName) {
+                return isset($this->listeners[$eventName]) ? $this->listeners[$eventName] : array();
+            }
+
+            return array_filter($this->listeners);
         }
 
         if (null !== $eventName) {