From 158f7cba33be33613b45424b6f1672dac7e101f4 Mon Sep 17 00:00:00 2001
From: Chaiwat Ekkaewnumchai <cekkaewnumchai@fb.com>
Date: Thu, 5 Sep 2019 03:02:02 -0700
Subject: [PATCH] ResizeSensor

Summary: _typescript_

Reviewed By: danielbuechele

Differential Revision: D17181422

fbshipit-source-id: 73b802ac339c7f7e474c9ee8f13b6aaa50884c97
---
 src/ui/components/ResizeSensor.tsx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ui/components/ResizeSensor.tsx b/src/ui/components/ResizeSensor.tsx
index 5baa4df29..870ddc9fb 100644
--- a/src/ui/components/ResizeSensor.tsx
+++ b/src/ui/components/ResizeSensor.tsx
@@ -39,14 +39,14 @@ export default class ResizeSensor extends Component<{
 
   componentDidMount() {
     const {iframe} = this;
-    if (iframe != null) {
+    if (iframe != null && iframe.contentWindow != null) {
       iframe.contentWindow.addEventListener('resize', this.handleResize);
     }
   }
 
   componentWillUnmount() {
     const {iframe} = this;
-    if (iframe != null) {
+    if (iframe != null && iframe.contentWindow != null) {
       iframe.contentWindow.removeEventListener('resize', this.handleResize);
     }
   }