From 304881d62cdb9193764b070a990106a7020765df Mon Sep 17 00:00:00 2001
From: Adam Barth <github@adambarth.com>
Date: Fri, 8 Jul 2016 13:39:39 -0700
Subject: [PATCH] Don't crash if no root semantics node (#2784)

Fixes #4849
---
 .../ios/framework/Source/accessibility_bridge.mm         | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sky/shell/platform/ios/framework/Source/accessibility_bridge.mm b/sky/shell/platform/ios/framework/Source/accessibility_bridge.mm
index 3fcb1d208..2e9416211 100644
--- a/sky/shell/platform/ios/framework/Source/accessibility_bridge.mm
+++ b/sky/shell/platform/ios/framework/Source/accessibility_bridge.mm
@@ -315,8 +315,13 @@ void AccessibilityBridge::UpdateSemanticsTree(
     }
   }
 
-  if (!view_.accessibilityElements) {
-    view_.accessibilityElements = @[ objects_[kRootNodeId] ];
+  SemanticObject* root = objects_[kRootNodeId];
+  if (root) {
+    if (!view_.accessibilityElements) {
+      view_.accessibilityElements = @[ root ];
+    }
+  } else {
+    view_.accessibilityElements = nil;
   }
   UIAccessibilityPostNotification(
       UIAccessibilityLayoutChangedNotification, nil);
-- 
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