From de5d809b00fde852bcf4e20e5f14b4ed9b09c9e5 Mon Sep 17 00:00:00 2001
From: Lars Brubaker <larsbrubaker@gmail.com>
Date: Tue, 31 May 2022 15:40:17 -0700
Subject: [PATCH] protect against null

---
 MatterControlLib/SetupWizard/HelpTreePanel.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/MatterControlLib/SetupWizard/HelpTreePanel.cs b/MatterControlLib/SetupWizard/HelpTreePanel.cs
index 066750184..0d53963ba 100644
--- a/MatterControlLib/SetupWizard/HelpTreePanel.cs
+++ b/MatterControlLib/SetupWizard/HelpTreePanel.cs
@@ -380,7 +380,10 @@ namespace MatterHackers.MatterControl
 				{
 					var newNode = new HelpArticleTreeNode(helpArticle, theme);
 
-					nodesByPath[helpArticle.Path] = newNode;
+					if (!string.IsNullOrEmpty(helpArticle.Path))
+					{
+						nodesByPath[helpArticle.Path] = newNode;
+					}
 
 					if (helpArticle.Name == guideKey
 						|| (guideKey != null