From 2f7a578c38eddc108028ea2aff34e7e4e9d68932 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@users.noreply.github.com>
Date: Fri, 29 Jun 2018 00:51:03 +0200
Subject: [PATCH] Added null check for panel.

Problem reared its head when #1709 was fixed.
---
 .../Primitives/SelectingItemsControl.cs               | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs b/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs
index 2e668fda95..a7b8981583 100644
--- a/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs
+++ b/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs
@@ -408,12 +408,15 @@ namespace Avalonia.Controls.Primitives
 
             var panel = (InputElement)Presenter.Panel;
 
-            foreach (var container in e.Containers)
+            if (panel != null)
             {
-                if (KeyboardNavigation.GetTabOnceActiveElement(panel) == container.ContainerControl)
+                foreach (var container in e.Containers)
                 {
-                    KeyboardNavigation.SetTabOnceActiveElement(panel, null);
-                    break;
+                    if (KeyboardNavigation.GetTabOnceActiveElement(panel) == container.ContainerControl)
+                    {
+                        KeyboardNavigation.SetTabOnceActiveElement(panel, null);
+                        break;
+                    }
                 }
             }
         }