fix: Avoid FocusManager usage before WASM fully initialized

unoplatform · Dec 21, 2021 · cb0dfc8 · cb0dfc8
1 parent 973afb6
commit cb0dfc8
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/Uno.UI/UI/Xaml/Input/FocusManager.wasm.cs b/src/Uno.UI/UI/Xaml/Input/FocusManager.wasm.cs
@@ -130,7 +130,9 @@ public static void ReceiveFocusNative(int handle)
 			{
 				// This might occur if a non-Uno element receives focus
 				var focusManager = VisualTree.GetFocusManagerForElement(Window.Current.RootElement);
-				focusManager.ClearFocus();
+
+				// The focus manager may be null if JS raises focusin/blur before the app is initialized.
+				focusManager?.ClearFocus();
 			}
 		}