Don't crash if no root semantics node (#2784)

Fixes #4849

Don't crash if no root semantics node (#2784)
Fixes #4849
304881d6 · Adam Barth · GitHub · d5fe823e · 304881d6
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Showing with 7 addition and 2 deletion

sky/shell/platform/ios/framework/Source/accessibility_bridge.mm ...ell/platform/ios/framework/Source/accessibility_bridge.mm +7 -2

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--- 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(
    }
  }

+  SemanticObject* root = objects_[kRootNodeId];
+  if (root) {
    if (!view_.accessibilityElements) {
-    view_.accessibilityElements = @[ objects_[kRootNodeId] ];
+      view_.accessibilityElements = @[ root ];
+    }
+  } else {
+    view_.accessibilityElements = nil;
  }
  UIAccessibilityPostNotification(
      UIAccessibilityLayoutChangedNotification, nil);