From 8c331534a9071a4b95e927cf9805ad5b455963c1 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Mon, 20 Jul 2020 15:44:19 -0300
Subject: [PATCH] fix nre on osx when tooltip closes.

---
 src/Avalonia.Native/WindowImplBase.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Avalonia.Native/WindowImplBase.cs b/src/Avalonia.Native/WindowImplBase.cs
index f916e95d7c..88956e41e1 100644
--- a/src/Avalonia.Native/WindowImplBase.cs
+++ b/src/Avalonia.Native/WindowImplBase.cs
@@ -432,7 +432,7 @@ namespace Avalonia.Native
 
                 TransparencyLevel = transparencyLevel;
 
-                _native.SetBlurEnabled(TransparencyLevel >= WindowTransparencyLevel.Blur);
+                _native?.SetBlurEnabled(TransparencyLevel >= WindowTransparencyLevel.Blur);
                 TransparencyLevelChanged?.Invoke(TransparencyLevel);
             }
         }