From fe863a8f7aba1aa4c2d74c28698da4565def48c8 Mon Sep 17 00:00:00 2001
From: Chakrit <chakrit.lj@gmail.com>
Date: Thu, 4 May 2017 17:44:40 +0700
Subject: [PATCH] Fix element sometimes already unmounted using with react

---
 src/ResizeSensor.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ResizeSensor.js b/src/ResizeSensor.js
index 7dd2dce..3b2e896 100755
--- a/src/ResizeSensor.js
+++ b/src/ResizeSensor.js
@@ -114,6 +114,7 @@
          * @param {Function}    resized
          */
         function attachResizeEvent(element, resized) {
+            if (!element) return;
             if (element.resizedAttached) {
                 element.resizedAttached.add(resized);
                 return;
@@ -209,6 +210,7 @@
 
     ResizeSensor.detach = function(element, ev) {
         forEachElement(element, function(elem){
+            if (!elem) return
             if(elem.resizedAttached && typeof ev == "function"){
                 elem.resizedAttached.remove(ev);
                 if(elem.resizedAttached.length()) return;