From e7613ca4d1604f2cf09db99007d6ce5412a8279a Mon Sep 17 00:00:00 2001
From: Johannes <johannes.kronmueller@gmail.com>
Date: Wed, 13 Jun 2018 09:47:14 +0200
Subject: [PATCH] [fix] onLayout TypeError if node already unmounted

Close #993
---
 .../src/modules/applyLayout/index.js                 | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/packages/react-native-web/src/modules/applyLayout/index.js b/packages/react-native-web/src/modules/applyLayout/index.js
index cae2ad1c..4fd58ae3 100644
--- a/packages/react-native-web/src/modules/applyLayout/index.js
+++ b/packages/react-native-web/src/modules/applyLayout/index.js
@@ -52,8 +52,10 @@ const observe = instance => {
 
   if (resizeObserver) {
     const node = findNodeHandle(instance);
-    node._layoutId = id;
-    resizeObserver.observe(node);
+    if (node) {
+      node._layoutId = id;
+      resizeObserver.observe(node);
+    }
   } else {
     instance._layoutId = id;
     instance._handleLayout();
@@ -64,8 +66,10 @@ const unobserve = instance => {
   delete registry[instance._layoutId];
   if (resizeObserver) {
     const node = findNodeHandle(instance);
-    delete node._layoutId;
-    resizeObserver.unobserve(node);
+    if (node) {
+      delete node._layoutId;
+      resizeObserver.unobserve(node);
+    }
   } else {
     delete instance._layoutId;
   }