From c1d6fe66864e797f486e7f4b1609438b270b0330 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Pedro?= <jpedrolmail@gmail.com>
Date: Sat, 28 Apr 2018 22:45:11 +0100
Subject: [PATCH] Fixed possible NullReferenceException in DefaultRenderLoop.

---
 src/Avalonia.Visuals/Rendering/DefaultRenderLoop.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Avalonia.Visuals/Rendering/DefaultRenderLoop.cs b/src/Avalonia.Visuals/Rendering/DefaultRenderLoop.cs
index 5dff3715b3..9cf849f59b 100644
--- a/src/Avalonia.Visuals/Rendering/DefaultRenderLoop.cs
+++ b/src/Avalonia.Visuals/Rendering/DefaultRenderLoop.cs
@@ -41,12 +41,12 @@ namespace Avalonia.Rendering
         {
             add
             {
+                _tick += value;
+
                 if (_subscriberCount++ == 0)
                 {
                     Start();
                 }
-
-                _tick += value;
             }
 
             remove