From f9f658c89f3ef0687884aa56e4c004f963b230f7 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@github.com>
Date: Wed, 11 Jan 2017 22:04:22 +0100
Subject: [PATCH] Handle null event source.

---
 src/Avalonia.Input/MouseDevice.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Avalonia.Input/MouseDevice.cs b/src/Avalonia.Input/MouseDevice.cs
index b9dd6c505d..4d54e44fc8 100644
--- a/src/Avalonia.Input/MouseDevice.cs
+++ b/src/Avalonia.Input/MouseDevice.cs
@@ -219,7 +219,7 @@ namespace Avalonia.Input
                 InputModifiers = inputModifiers
             };
 
-            source.RaiseEvent(e);
+            source?.RaiseEvent(e);
             return e.Handled;
         }