From 78ae2adb5bdd7a3224b32a99664ba6d6d64c52cb Mon Sep 17 00:00:00 2001
From: Christian Flothmann <christian.flothmann@xabbuh.de>
Date: Thu, 31 Mar 2016 19:22:31 +0200
Subject: [PATCH] [EventDispatcher] check for method to exist

---
 .../EventDispatcher/Debug/TraceableEventDispatcher.php |  4 ++++
 .../Tests/Debug/TraceableEventDispatcherTest.php       | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php b/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
index 75ba2a760f..0ea35fa0e3 100644
--- a/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
+++ b/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
@@ -104,6 +104,10 @@ class TraceableEventDispatcher implements TraceableEventDispatcherInterface
      */
     public function getListenerPriority($eventName, $listener)
     {
+        if (!method_exists($this->dispatcher, 'getListenerPriority')) {
+            return 0;
+        }
+
         return $this->dispatcher->getListenerPriority($eventName, $listener);
     }
 
diff --git a/src/Symfony/Component/EventDispatcher/Tests/Debug/TraceableEventDispatcherTest.php b/src/Symfony/Component/EventDispatcher/Tests/Debug/TraceableEventDispatcherTest.php
index 2dd8292a1b..dd54e73b34 100644
--- a/src/Symfony/Component/EventDispatcher/Tests/Debug/TraceableEventDispatcherTest.php
+++ b/src/Symfony/Component/EventDispatcher/Tests/Debug/TraceableEventDispatcherTest.php
@@ -73,6 +73,16 @@ class TraceableEventDispatcherTest extends \PHPUnit_Framework_TestCase
         $this->assertSame(123, $tdispatcher->getListenerPriority('foo', $listeners[0]));
     }
 
+    public function testGetListenerPriorityReturnsZeroWhenWrappedMethodDoesNotExist()
+    {
+        $dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+        $traceableEventDispatcher = new TraceableEventDispatcher($dispatcher, new Stopwatch());
+        $traceableEventDispatcher->addListener('foo', function () {}, 123);
+        $listeners = $traceableEventDispatcher->getListeners('foo');
+
+        $this->assertSame(0, $traceableEventDispatcher->getListenerPriority('foo', $listeners[0]));
+    }
+
     public function testAddRemoveSubscriber()
     {
         $dispatcher = new EventDispatcher();