From 87e8cb892384127b7be314a7da8678bc1deefe44 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Pedro?= <jpedrolmail@gmail.com>
Date: Sat, 8 Jul 2017 18:14:06 +0100
Subject: [PATCH] Fixed PossibleNullReferenceException.

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

diff --git a/src/Avalonia.Controls/Window.cs b/src/Avalonia.Controls/Window.cs
index 3535510ce3..7f0cab3237 100644
--- a/src/Avalonia.Controls/Window.cs
+++ b/src/Avalonia.Controls/Window.cs
@@ -336,8 +336,11 @@ namespace Avalonia.Controls
         {
             if (WindowStartupLocation == WindowStartupLocation.CenterScreen)
             {
-                var positionAsSize = PlatformImpl.MaxClientSize / 2 - ClientSize / 2;
-                Position = new Point(positionAsSize.Width, positionAsSize.Height);
+                if (PlatformImpl != null)
+                {
+                    var positionAsSize = PlatformImpl.MaxClientSize / 2 - ClientSize / 2;
+                    Position = new Point(positionAsSize.Width, positionAsSize.Height);
+                }
             }
             else if (WindowStartupLocation == WindowStartupLocation.CenterOwner)
             {