From 8403608aa0f18e68a6d79d08dfef623eacf3a0a3 Mon Sep 17 00:00:00 2001
From: Fabian Eichinger <fabian.eichinger@gmail.com>
Date: Fri, 5 Feb 2016 23:07:55 +0100
Subject: [PATCH] Snapshot the Set of listeners registered to BackAndroid
 before dispatching an event

---
 Libraries/Utilities/BackAndroid.android.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Libraries/Utilities/BackAndroid.android.js b/Libraries/Utilities/BackAndroid.android.js
index ed920e22c92759..c0a084c9a1e239 100644
--- a/Libraries/Utilities/BackAndroid.android.js
+++ b/Libraries/Utilities/BackAndroid.android.js
@@ -23,8 +23,9 @@ type BackPressEventName = $Enum<{
 var _backPressSubscriptions = new Set();
 
 RCTDeviceEventEmitter.addListener(DEVICE_BACK_EVENT, function() {
+  var backPressSubscriptions = new Set(_backPressSubscriptions);
   var invokeDefault = true;
-  _backPressSubscriptions.forEach((subscription) => {
+  backPressSubscriptions.forEach((subscription) => {
     if (subscription()) {
       invokeDefault = false;
     }