From 1330df55f1eefe6db3050e9dd90e6ffa88c900db Mon Sep 17 00:00:00 2001
From: Dennis Eichhorn <spl1nes.com@googlemail.com>
Date: Fri, 14 Apr 2017 12:12:25 +0200
Subject: [PATCH] Fixed undefined group

---
 Event/EventManager.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Event/EventManager.php b/Event/EventManager.php
index ee10c1ba1..b5b7a60b8 100644
--- a/Event/EventManager.php
+++ b/Event/EventManager.php
@@ -77,6 +77,10 @@ class EventManager
      */
     public function trigger(string $group, string $id = '') /* : void */
     {
+        if(!isset($this->callbacks[$group])) {
+            return;
+        }
+
         if (isset($this->groups[$group])) {
             $this->groups[$group][$id] = true;
         }