From c907172b8f07dace7801ddd0848f4c982cb8f794 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Wed, 11 Dec 2019 10:06:12 -0300
Subject: [PATCH] [OSX] null check to prevent NRE when window closes.

---
 src/Avalonia.Native/WindowImplBase.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Avalonia.Native/WindowImplBase.cs b/src/Avalonia.Native/WindowImplBase.cs
index e72fefe3ce..5d701dc8df 100644
--- a/src/Avalonia.Native/WindowImplBase.cs
+++ b/src/Avalonia.Native/WindowImplBase.cs
@@ -353,6 +353,11 @@ namespace Avalonia.Native
 
         public void SetCursor(IPlatformHandle cursor)
         {
+            if (_native == null)
+            {
+                return;
+            }
+            
             var newCursor = cursor as AvaloniaNativeCursor;
             newCursor = newCursor ?? (_cursorFactory.GetCursor(StandardCursorType.Arrow) as AvaloniaNativeCursor);
             _native.Cursor = newCursor.Cursor;