From 204b619078c7deef3c26c618ec075b8561dd67b9 Mon Sep 17 00:00:00 2001
From: Brian Vaughn <bvaughn@fb.com>
Date: Tue, 7 Apr 2020 09:02:59 -0700
Subject: [PATCH] DevTools Profiler: Fix "cannot read property 'memoizedState'
 of null"

---
 packages/react-devtools-shared/src/backend/renderer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/react-devtools-shared/src/backend/renderer.js b/packages/react-devtools-shared/src/backend/renderer.js
index 17e5930f2977a..0bf109d4268f8 100644
--- a/packages/react-devtools-shared/src/backend/renderer.js
+++ b/packages/react-devtools-shared/src/backend/renderer.js
@@ -918,7 +918,7 @@ export function attach(
   }
 
   function didHooksChange(prev: any, next: any): boolean {
-    if (next == null) {
+    if (prev == null || next == null) {
       return false;
     }