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
diff --git a/MatterControlLib/SlicerConfiguration/EngineMappingsMatterSlice.cs b/MatterControlLib/SlicerConfiguration/EngineMappingsMatterSlice.cs
index 599f5835a..9e0eb2da6 100644
--- a/MatterControlLib/SlicerConfiguration/EngineMappingsMatterSlice.cs
+++ b/MatterControlLib/SlicerConfiguration/EngineMappingsMatterSlice.cs
@@ -633,7 +633,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 							mergeString += "+";
 						}
 					}
-					else if (holes.Any())
+					else if (holes?.Any() == true)
                     {
 						mergeString += ",";
                     }