Return no next view when a ScrollView's content view is gone

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollViewHelper.kt

@@ -577,6 +577,8 @@ public object ReactScrollViewHelper {
       return null
     }
 
+    val contentView = host.getChildAt(0) ?: return null
+
     val uimanager =
         UIManagerHelper.getUIManager(host.context as ReactContext, UIManagerType.FABRIC)
             ?: return null
@@ -586,9 +588,8 @@ public object ReactScrollViewHelper {
             ?: return null
 
     val ancestorIdList =
-        uimanager
-            .getRelativeAncestorList(host.getChildAt(0).id, nextFocusableViewId)
-            ?.toMutableSet() ?: return null
+        uimanager.getRelativeAncestorList(contentView.id, nextFocusableViewId)?.toMutableSet()
+            ?: return null
 
     ancestorIdList.add(nextFocusableViewId)
 

packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/scroll/ReactScrollViewHelperFocusSearchTest.kt

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// The deprecated APIs exercised here remain public and required by this Robolectric setup.
+@file:Suppress("DEPRECATION")
+
+package com.facebook.react.views.scroll
+
+import android.view.View
+import com.facebook.react.bridge.BridgeReactContext
+import com.facebook.react.bridge.ReactTestHelper.createMockCatalystInstance
+import com.facebook.react.fabric.FabricUIManager
+import com.facebook.react.internal.featureflags.ReactNativeFeatureFlagsForTests
+import com.facebook.react.uimanager.ThemedReactContext
+import com.facebook.react.uimanager.UIManagerHelper
+import com.facebook.react.uimanager.common.UIManagerType
+import com.facebook.react.uimanager.events.EventDispatcher
+import com.facebook.soloader.SoLoader
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.MockedStatic
+import org.mockito.Mockito.mockStatic
+import org.mockito.kotlin.any
+import org.mockito.kotlin.anyOrNull
+import org.mockito.kotlin.eq
+import org.mockito.kotlin.mock
+import org.mockito.kotlin.whenever
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.RuntimeEnvironment
+
+/** Verifies the shadow-tree focus search on a scroll view whose content view is gone. */
+@RunWith(RobolectricTestRunner::class)
+class ReactScrollViewHelperFocusSearchTest {
+
+  private lateinit var themedContext: ThemedReactContext
+  private lateinit var uiManagerHelperMock: MockedStatic<UIManagerHelper>
+
+  @Before
+  fun setup() {
+    ReactNativeFeatureFlagsForTests.setUp()
+    SoLoader.setInTestMode()
+    val context = BridgeReactContext(RuntimeEnvironment.getApplication())
+    context.initializeWithInstance(createMockCatalystInstance())
+    themedContext = ThemedReactContext(context, context, null, -1)
+
+    val fabricUIManager: FabricUIManager = mock()
+    whenever(fabricUIManager.findNextFocusableElement(any(), any(), any())).thenReturn(NEXT_TAG)
+
+    uiManagerHelperMock = mockStatic(UIManagerHelper::class.java)
+    uiManagerHelperMock
+        .`when`<EventDispatcher?> { UIManagerHelper.getEventDispatcher(anyOrNull()) }
+        .thenReturn(mock())
+    uiManagerHelperMock
+        .`when`<FabricUIManager?> { UIManagerHelper.getUIManager(any(), eq(UIManagerType.FABRIC)) }
+        .thenReturn(fabricUIManager)
+  }
+
+  @After
+  fun teardown() {
+    uiManagerHelperMock.close()
+  }
+
+  @Test
+  fun testScrollViewWithoutContentViewHasNoNextFocusableView() {
+    val scrollView = ReactScrollView(themedContext)
+    val focused = View(themedContext)
+
+    assertThat(ReactScrollViewHelper.findNextFocusableView(scrollView, focused, View.FOCUS_DOWN))
+        .isNull()
+  }
+
+  @Test
+  fun testHorizontalScrollViewWithoutContentViewHasNoNextFocusableView() {
+    val scrollView = ReactHorizontalScrollView(themedContext)
+    val focused = View(themedContext)
+
+    assertThat(ReactScrollViewHelper.findNextFocusableView(scrollView, focused, View.FOCUS_RIGHT))
+        .isNull()
+  }
+
+  private companion object {
+    const val NEXT_TAG = 42
+  }
+}