From f01c3df7c8d3b413cca9178393efb64e4b1ecffb Mon Sep 17 00:00:00 2001
From: John Lewin <lewin76@gmail.com>
Date: Fri, 9 Feb 2018 13:50:05 -0800
Subject: [PATCH] Use sceneContext instead of printer

- Issue MatterHackers/MCCentral#2808
Unguarded/invalid reference to printer causes null reference error
---
 PartPreviewWindow/ViewControls3D.cs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/PartPreviewWindow/ViewControls3D.cs b/PartPreviewWindow/ViewControls3D.cs
index ab126d949..46468c8c1 100644
--- a/PartPreviewWindow/ViewControls3D.cs
+++ b/PartPreviewWindow/ViewControls3D.cs
@@ -87,7 +87,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 		private EventHandler unregisterEvents;
 
-		private PrinterConfig printer;
 		private View3DWidget view3DWidget;
 		private BedConfig sceneContext;
 
@@ -159,7 +158,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 				view3DWidget.InteractionLayer.Focus();
 			};
 
-			this.printer = sceneContext.Printer;
 			this.IsPrinterMode = isPrinterType;
 			this.sceneContext = sceneContext;
 
@@ -195,7 +193,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 			};
 			undoButton.Click += (sender, e) =>
 			{
-				printer.Bed.Scene.SelectedItem = null;
+				sceneContext.Scene.SelectedItem = null;
 				undoBuffer.Undo();
 				view3DWidget.InteractionLayer.Focus();
 			};