From 3ed289b3b1286007e3f594b0b767b3b64bf3f86c Mon Sep 17 00:00:00 2001
From: Dan Abramov <dan.abramov@gmail.com>
Date: Wed, 21 Aug 2019 19:49:22 +0100
Subject: [PATCH] Clear canceled task node early (#16403)

---
 .../react-reconciler/src/SchedulerWithReactIntegration.js     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/react-reconciler/src/SchedulerWithReactIntegration.js b/packages/react-reconciler/src/SchedulerWithReactIntegration.js
index fc948f3f908a4..3447fdcaebf21 100644
--- a/packages/react-reconciler/src/SchedulerWithReactIntegration.js
+++ b/packages/react-reconciler/src/SchedulerWithReactIntegration.js
@@ -160,7 +160,9 @@ export function cancelCallback(callbackNode: mixed) {
 
 export function flushSyncCallbackQueue() {
   if (immediateQueueCallbackNode !== null) {
-    Scheduler_cancelCallback(immediateQueueCallbackNode);
+    const node = immediateQueueCallbackNode;
+    immediateQueueCallbackNode = null;
+    Scheduler_cancelCallback(node);
   }
   flushSyncCallbackQueueImpl();
 }