From 27dd2ecedb82b4e3b6807e3859194cce643bf2c3 Mon Sep 17 00:00:00 2001
From: John Lewin <lewin76@gmail.com>
Date: Fri, 6 Apr 2018 16:02:51 -0700
Subject: [PATCH] Guard against observed exception

---
 .../GCodeRenderer/ExtrusionColors.cs                | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/MatterControl.OpenGL/GCodeRenderer/ExtrusionColors.cs b/MatterControl.OpenGL/GCodeRenderer/ExtrusionColors.cs
index 4bff7d2b8..a23ef7f72 100644
--- a/MatterControl.OpenGL/GCodeRenderer/ExtrusionColors.cs
+++ b/MatterControl.OpenGL/GCodeRenderer/ExtrusionColors.cs
@@ -47,9 +47,16 @@ namespace MatterHackers.GCodeVisualizer
 
 		public ExtrusionColors(HashSet<float> speeds)
 		{
-			min = speeds.Min();
-			max = speeds.Max();
-
+			if (speeds.Any())
+			{
+				min = speeds.Min();
+				max = speeds.Max();
+			}
+			else
+			{
+				min = 0;
+				max = 1;
+			}
 			range = max - min;
 			delta = startColor - endColor;