From 47676e6be24ee654307ac216c5cf83feb5fda682 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Sat, 18 Aug 2018 14:46:26 +0100
Subject: [PATCH] fix null reference exception.

---
 src/Avalonia.Controls/MenuItem.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Avalonia.Controls/MenuItem.cs b/src/Avalonia.Controls/MenuItem.cs
index dde689e89c..91f427936c 100644
--- a/src/Avalonia.Controls/MenuItem.cs
+++ b/src/Avalonia.Controls/MenuItem.cs
@@ -368,9 +368,12 @@ namespace Avalonia.Controls
         /// </summary>
         private void CloseSubmenus()
         {
-            foreach (var child in Items.OfType<MenuItem>())
+            if (Items != null)
             {
-                child.IsSubMenuOpen = false;
+                foreach (var child in Items.OfType<MenuItem>())
+                {
+                    child.IsSubMenuOpen = false;
+                }
             }
         }