From 0dcf31bdcdfa778faf3669e0b35d1127fa4b1f12 Mon Sep 17 00:00:00 2001
From: larsbrubaker <larsbrubaker@gmail.com>
Date: Mon, 14 Apr 2014 16:45:08 -0700
Subject: [PATCH] make sure we don't crash if generate is pushed when no model
 loaded.

---
 PartPreviewWindow/GcodeViewBasic.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PartPreviewWindow/GcodeViewBasic.cs b/PartPreviewWindow/GcodeViewBasic.cs
index 5ce14ba05..c0981981c 100644
--- a/PartPreviewWindow/GcodeViewBasic.cs
+++ b/PartPreviewWindow/GcodeViewBasic.cs
@@ -626,7 +626,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
         void DoGenerateButton_Click(object state)
         {
-            if (ActiveSliceSettings.Instance.IsValid())
+            if (ActiveSliceSettings.Instance.IsValid() && printItem != null)
             {
                 ((Button)state).Visible = false;
                 SlicingQueue.Instance.QueuePartForSlicing(printItem);