From 20ee52877fbefe6e70045b3ae2589dac02c1e34e Mon Sep 17 00:00:00 2001
From: NGUYEN PHUC LOC <51690529+locnp-active@users.noreply.github.com>
Date: Fri, 9 Oct 2026 16:33:26 +0700
Subject: [PATCH] Fix race in UiThreadUtil main handler lazy initialization

---
 .../src/main/java/com/facebook/react/bridge/UiThreadUtil.kt     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/UiThreadUtil.kt b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/UiThreadUtil.kt
index 421091a14de5..c8683776fbc3 100644
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/UiThreadUtil.kt
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/UiThreadUtil.kt
@@ -15,7 +15,7 @@ import com.facebook.react.common.build.ReactBuildConfig
 public object UiThreadUtil {
 
   private val mainHandler: Handler by
-      lazy(LazyThreadSafetyMode.NONE) { Handler(Looper.getMainLooper()) }
+      lazy(LazyThreadSafetyMode.SYNCHRONIZED) { Handler(Looper.getMainLooper()) }
 
   /**
    * Returns the handler associated with the main (UI) thread.