From a828e5b4f5664a4aaf50280a7cf423d59e248da7 Mon Sep 17 00:00:00 2001
From: Giuseppe Lippolis <workgroupengineering@outlook.com>
Date: Tue, 19 Oct 2021 10:12:36 +0200
Subject: [PATCH] fixes: MenuFlyout Possible null reference argument for
 parameter

---
 src/Avalonia.Controls/Flyouts/FlyoutBase.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Controls/Flyouts/FlyoutBase.cs b/src/Avalonia.Controls/Flyouts/FlyoutBase.cs
index 4b903d056c..b874d149bf 100644
--- a/src/Avalonia.Controls/Flyouts/FlyoutBase.cs
+++ b/src/Avalonia.Controls/Flyouts/FlyoutBase.cs
@@ -562,8 +562,12 @@ namespace Avalonia.Controls.Primitives
             return eventArgs.Cancel;
         }
 
-        internal static void SetPresenterClasses(IControl presenter, Classes classes)
+        internal static void SetPresenterClasses(IControl? presenter, Classes classes)
         {
+            if(presenter is null)
+            {
+                return;
+            }
             //Remove any classes no longer in use, ignoring pseudo classes
             for (int i = presenter.Classes.Count - 1; i >= 0; i--)
             {