From 45eef8b6b5df27c661b3e33e579abc11b563c65b Mon Sep 17 00:00:00 2001
From: Dominic Gannaway <trueadm@users.noreply.github.com>
Date: Wed, 15 Jul 2020 14:17:48 +0100
Subject: [PATCH] Devtools: improve getID guard (#19364)

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

diff --git a/packages/react-devtools-shared/src/backend/legacy/renderer.js b/packages/react-devtools-shared/src/backend/legacy/renderer.js
index 2d7e9df0ed..547901d4b7 100644
--- a/packages/react-devtools-shared/src/backend/legacy/renderer.js
+++ b/packages/react-devtools-shared/src/backend/legacy/renderer.js
@@ -165,7 +165,7 @@ export function attach(
   }
 
   function getID(internalInstance: InternalInstance): number {
-    if (typeof internalInstance !== 'object') {
+    if (typeof internalInstance !== 'object' || internalInstance === null) {
       throw new Error('Invalid internal instance: ' + internalInstance);
     }
     if (!internalInstanceToIDMap.has(internalInstance)) {