From 7d2cc4d4e2dc9864e08f2dd4a00bb08bfd7ac8b6 Mon Sep 17 00:00:00 2001
From: Andrei <andrei.misiukevich@gmail.com>
Date: Tue, 23 Oct 2018 19:13:47 +0300
Subject: [PATCH] https://github.com/xamarin/Xamarin.Forms/issues/4076 fix
 (#4161)

---
 Xamarin.Forms.Platform.MacOS/Renderers/EntryRenderer.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Xamarin.Forms.Platform.MacOS/Renderers/EntryRenderer.cs b/Xamarin.Forms.Platform.MacOS/Renderers/EntryRenderer.cs
index e31477ef86f..72edb58c41c 100644
--- a/Xamarin.Forms.Platform.MacOS/Renderers/EntryRenderer.cs
+++ b/Xamarin.Forms.Platform.MacOS/Renderers/EntryRenderer.cs
@@ -77,7 +77,7 @@ void HandleWindowDidResignKey(object sender, EventArgs args)
 
 			void HandleWindowDidBecomeKey(object sender, EventArgs args)
 			{
-				if (CurrentEditor == Window.FirstResponder)
+				if (Window != null && CurrentEditor == Window.FirstResponder)
 					FocusChanged?.Invoke(this, new BoolEventArgs(true));
 			}
 		}