From 2db442c080d8755904baf90496b69dca36324931 Mon Sep 17 00:00:00 2001
From: adrian <adrian-sw@aporter.org>
Date: Thu, 15 Feb 2018 12:08:37 -0500
Subject: [PATCH] fixes callstack described in #17348

---
 Libraries/Components/Subscribable.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Libraries/Components/Subscribable.js b/Libraries/Components/Subscribable.js
index 0244ad673c2404..596fd3dfbdb747 100644
--- a/Libraries/Components/Subscribable.js
+++ b/Libraries/Components/Subscribable.js
@@ -30,7 +30,7 @@ Subscribable.Mixin = {
   },
 
   componentWillUnmount: function() {
-    this._subscribableSubscriptions.forEach(
+    this._subscribableSubscriptions && this._subscribableSubscriptions.forEach(
       (subscription) => subscription.remove()
     );
     this._subscribableSubscriptions = null;