From 9c6e69914dbc8f6003e319d0d2c2f847d5fd089c Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Mon, 13 Aug 2018 18:06:42 +0100
Subject: [PATCH] fixes an occasional crash with popup root
 "SnapInsideScreenEdges"

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

diff --git a/src/Avalonia.Controls/Primitives/PopupRoot.cs b/src/Avalonia.Controls/Primitives/PopupRoot.cs
index 457a7bd4b4..996eb6204d 100644
--- a/src/Avalonia.Controls/Primitives/PopupRoot.cs
+++ b/src/Avalonia.Controls/Primitives/PopupRoot.cs
@@ -83,9 +83,7 @@ namespace Avalonia.Controls.Primitives
         /// </summary>
         public void SnapInsideScreenEdges()
         {
-            var window = this.GetSelfAndLogicalAncestors().OfType<Window>().First();
-            
-            var screen = window.Screens.ScreenFromPoint(Position);
+            var screen = Application.Current.MainWindow.Screens.ScreenFromPoint(Position);
 
             var screenX = Position.X + Bounds.Width - screen.Bounds.X;
             var screenY = Position.Y + Bounds.Height - screen.Bounds.Y;