From c7da9c4bb86cc3583e796a45106ebb9fb8e6ad0d Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@users.noreply.github.com>
Date: Fri, 14 Jul 2023 11:01:38 +0200
Subject: [PATCH] Allow null item in BindingHelper.Evaluate.

Fixes #11220.
---
 src/Avalonia.Controls/Primitives/SelectingItemsControl.cs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs b/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs
index e22d03273a..66ed1a27e2 100644
--- a/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs
+++ b/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs
@@ -1395,10 +1395,8 @@ namespace Avalonia.Controls.Primitives
 
             public object Evaluate(object? dataContext)
             {
-                dataContext = dataContext ?? throw new ArgumentNullException(nameof(dataContext));
-
                 // Only update the DataContext if necessary
-                if (!dataContext.Equals(DataContext))
+                if (!Equals(dataContext, DataContext))
                     DataContext = dataContext;
 
                 return GetValue(ValueProperty);