From 84639ab53fcb83c5d4806b5d791bb07992c40bf1 Mon Sep 17 00:00:00 2001
From: Timothy Yung <yungsters@fb.com>
Date: Thu, 8 Jul 2021 16:01:51 -0700
Subject: [PATCH] Guard against reused fibers in React Native commands (#21837)

---
 .../react-native-renderer/src/ReactFabric.js  | 22 +++++++++----------
 .../src/ReactNativeRenderer.js                | 21 +++++++++---------
 2 files changed, 20 insertions(+), 23 deletions(-)

diff --git a/packages/react-native-renderer/src/ReactFabric.js b/packages/react-native-renderer/src/ReactFabric.js
index c79868af51f0e..6fe3eeb12d244 100644
--- a/packages/react-native-renderer/src/ReactFabric.js
+++ b/packages/react-native-renderer/src/ReactFabric.js
@@ -160,16 +160,14 @@ function dispatchCommand(handle: any, command: string, args: Array<any>) {
           'native component. Use React.forwardRef to get access to the underlying native component',
       );
     }
-
     return;
   }
 
-  if (handle._internalInstanceHandle) {
-    nativeFabricUIManager.dispatchCommand(
-      handle._internalInstanceHandle.stateNode.node,
-      command,
-      args,
-    );
+  if (handle._internalInstanceHandle != null) {
+    const {stateNode} = handle._internalInstanceHandle;
+    if (stateNode != null) {
+      nativeFabricUIManager.dispatchCommand(stateNode.node, command, args);
+    }
   } else {
     UIManager.dispatchViewManagerCommand(handle._nativeTag, command, args);
   }
@@ -186,11 +184,11 @@ function sendAccessibilityEvent(handle: any, eventType: string) {
     return;
   }
 
-  if (handle._internalInstanceHandle) {
-    nativeFabricUIManager.sendAccessibilityEvent(
-      handle._internalInstanceHandle.stateNode.node,
-      eventType,
-    );
+  if (handle._internalInstanceHandle != null) {
+    const {stateNode} = handle._internalInstanceHandle;
+    if (stateNode != null) {
+      nativeFabricUIManager.sendAccessibilityEvent(stateNode.node, eventType);
+    }
   } else {
     legacySendAccessibilityEvent(handle._nativeTag, eventType);
   }
diff --git a/packages/react-native-renderer/src/ReactNativeRenderer.js b/packages/react-native-renderer/src/ReactNativeRenderer.js
index fdb1c05fed94f..3c3f234e0cb66 100644
--- a/packages/react-native-renderer/src/ReactNativeRenderer.js
+++ b/packages/react-native-renderer/src/ReactNativeRenderer.js
@@ -160,12 +160,11 @@ function dispatchCommand(handle: any, command: string, args: Array<any>) {
     return;
   }
 
-  if (handle._internalInstanceHandle) {
-    nativeFabricUIManager.dispatchCommand(
-      handle._internalInstanceHandle.stateNode.node,
-      command,
-      args,
-    );
+  if (handle._internalInstanceHandle != null) {
+    const {stateNode} = handle._internalInstanceHandle;
+    if (stateNode != null) {
+      nativeFabricUIManager.dispatchCommand(stateNode.node, command, args);
+    }
   } else {
     UIManager.dispatchViewManagerCommand(handle._nativeTag, command, args);
   }
@@ -182,11 +181,11 @@ function sendAccessibilityEvent(handle: any, eventType: string) {
     return;
   }
 
-  if (handle._internalInstanceHandle) {
-    nativeFabricUIManager.sendAccessibilityEvent(
-      handle._internalInstanceHandle.stateNode.node,
-      eventType,
-    );
+  if (handle._internalInstanceHandle != null) {
+    const {stateNode} = handle._internalInstanceHandle;
+    if (stateNode != null) {
+      nativeFabricUIManager.sendAccessibilityEvent(stateNode.node, eventType);
+    }
   } else {
     legacySendAccessibilityEvent(handle._nativeTag, eventType);
   }