From 7f727449c47e029018f5b38c019ead051d7c5039 Mon Sep 17 00:00:00 2001
From: Ken van der Eerden <kenvandereerden@hotmail.com>
Date: Fri, 22 Jan 2016 14:58:26 +0100
Subject: [PATCH] error prevention

after calling off(true) and clearing all listeners, var listeners set in on() function is not cleared. This could cause errors when calling functions desired to be unsubscribed.
---
 src/util/pubsub.js | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/util/pubsub.js b/src/util/pubsub.js
index 818a54b3..c5f3022f 100644
--- a/src/util/pubsub.js
+++ b/src/util/pubsub.js
@@ -164,8 +164,8 @@
                 return this;
             }
 
-            var listeners = this._topics[ topic ]
-                ,l = listeners && listeners.length
+            var l = this._topics[ topic ] && this._topics[ topic ].length
+                ,listeners
                 ,handler
                 ,e
                 ,scratch = Physics.scratchpad()
@@ -183,11 +183,12 @@
             // reverse iterate so priorities work out correctly
             while ( l-- ){
 
-                handler = listeners[ l ];
-                handler( data, e );
+                listeners = this._topics[ topic ];
+                handler = listeners && listeners[ l ];
+                handler && handler( data, e );
 
                 // if _one_ flag is set, the unsubscribe
-                if ( handler._one_ ){
+                if ( handler && handler._one_ ){
                     listeners.splice( l, 1 );
                 }
             }