From fefa1269e2a67fa5ef0992d5cc1d6114b7948b7e Mon Sep 17 00:00:00 2001
From: Andrew Clark <git@andrewclark.io>
Date: Tue, 23 Oct 2018 14:27:04 -0700
Subject: [PATCH] Revert accidentally committed existence check (#13931)

---
 packages/react-reconciler/src/ReactFiberCommitWork.js | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.js b/packages/react-reconciler/src/ReactFiberCommitWork.js
index 1efd1fcf8d..60662d2388 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.js
@@ -499,13 +499,7 @@ function commitUnmount(current: Fiber): void {
     case ClassComponent: {
       safelyDetachRef(current);
       const instance = current.stateNode;
-      if (
-        // Typically, a component that mounted will have an instance. However,
-        // outside of concurrent mode, a suspended component may commit without
-        // an instance, so we need to check whether it exists.
-        instance !== null &&
-        typeof instance.componentWillUnmount === 'function'
-      ) {
+      if (typeof instance.componentWillUnmount === 'function') {
         safelyCallComponentWillUnmount(current, instance);
       }
       return;