From 33eddbc0c80652f5a2e7307345f998828ed5a267 Mon Sep 17 00:00:00 2001
From: Vasiliy <Yeti.or@gmail.com>
Date: Wed, 21 Mar 2018 12:41:50 +0300
Subject: [PATCH] Fix falling in dev mode (#12407)

FiberNode stateNode could be null

So I get TypeError:

```
  at performWorkOnRoot (/tmp/my-project/node_modules/react-dom/cjs/react-dom.development.js:11014:24) TypeError: Cannot read property '_warnedAboutRefsInRender' of null
          at findDOMNode (/tmp/my-project/node_modules/react-dom/cjs/react-dom.development.js:15264:55)
```
---
 packages/react-dom/src/client/ReactDOM.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/react-dom/src/client/ReactDOM.js b/packages/react-dom/src/client/ReactDOM.js
index a2576e2e70..a06dca184d 100644
--- a/packages/react-dom/src/client/ReactDOM.js
+++ b/packages/react-dom/src/client/ReactDOM.js
@@ -1126,7 +1126,7 @@ const ReactDOM: Object = {
   ): null | Element | Text {
     if (__DEV__) {
       let owner = (ReactCurrentOwner.current: any);
-      if (owner !== null) {
+      if (owner !== null && owner.stateNode !== null) {
         const warnedAboutRefsInRender =
           owner.stateNode._warnedAboutRefsInRender;
         warning(