From b6650a8e4b0acceae33de13a9918760daaaafa84 Mon Sep 17 00:00:00 2001
From: Jumar Macato <16554748+jmacato@users.noreply.github.com>
Date: Fri, 3 Sep 2021 18:23:54 +0800
Subject: [PATCH] Update src/Avalonia.Controls/AutoCompleteBox.cs

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

diff --git a/src/Avalonia.Controls/AutoCompleteBox.cs b/src/Avalonia.Controls/AutoCompleteBox.cs
index 265a354af6..0e946126ea 100644
--- a/src/Avalonia.Controls/AutoCompleteBox.cs
+++ b/src/Avalonia.Controls/AutoCompleteBox.cs
@@ -2100,7 +2100,7 @@ namespace Avalonia.Controls
                     }
                     else
                     {
-                        if (ItemFilter == null)
+                        if (ItemFilter is null)
                         {
                             throw new Exception("ItemFilter property can not be null when FilterMode has value AutoCompleteFilterMode.Custom");
                         }