From e82d67f66454bde076a1250009f17a2ad0fb54c9 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Sun, 28 Jul 2019 19:30:07 +0200
Subject: [PATCH] Prevent NRE in VisualNode.HitTest.

Not sure how this is happening but judging by #2758, it can happen. Defensively check for a null `Item` to prevent this.

Fixes #2758.
---
 src/Avalonia.Visuals/Rendering/SceneGraph/VisualNode.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Avalonia.Visuals/Rendering/SceneGraph/VisualNode.cs b/src/Avalonia.Visuals/Rendering/SceneGraph/VisualNode.cs
index 4e95d21a48..12cfc7cbe3 100644
--- a/src/Avalonia.Visuals/Rendering/SceneGraph/VisualNode.cs
+++ b/src/Avalonia.Visuals/Rendering/SceneGraph/VisualNode.cs
@@ -236,7 +236,7 @@ namespace Avalonia.Rendering.SceneGraph
         {
             foreach (var operation in DrawOperations)
             {
-                if (operation.Item.HitTest(p))
+                if (operation?.Item?.HitTest(p) == true)
                 {
                     return true;
                 }