From 5a7479ff074a4737595524e665da9a95222d707f Mon Sep 17 00:00:00 2001
From: Nikita Tsukanov <keks9n@gmail.com>
Date: Mon, 6 Nov 2023 15:15:35 +0300
Subject: [PATCH] Fix ImageBrush crash when source bitmap gets disposed
 (#13506)

---
 src/Avalonia.Base/Media/Imaging/Bitmap.cs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Base/Media/Imaging/Bitmap.cs b/src/Avalonia.Base/Media/Imaging/Bitmap.cs
index fbe9370edc..45a547f16a 100644
--- a/src/Avalonia.Base/Media/Imaging/Bitmap.cs
+++ b/src/Avalonia.Base/Media/Imaging/Bitmap.cs
@@ -240,6 +240,16 @@ namespace Avalonia.Media.Imaging
             return AvaloniaLocator.Current.GetRequiredService<IPlatformRenderInterface>();
         }
 
-        IRef<IBitmapImpl> IImageBrushSource.Bitmap => PlatformImpl;
+        IRef<IBitmapImpl>? IImageBrushSource.Bitmap
+        {
+            get
+            {
+                // TODO12: We should probably make PlatformImpl to be nullable or make it possible to check
+                // and fix IRef<T> in general (right now Item is not nullable while it internally is)
+                if (PlatformImpl.Item == null!)
+                    return null;
+                return PlatformImpl;
+            }
+        }
     }
 }