From 4a9d2d321a99b75667ba10d78fc52290c9d97f6c Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Fri, 13 Mar 2015 15:45:40 -0400
Subject: [PATCH] Crashed attempting to access non-existing element. Fixes
 #1258

---
 src/cgalutils.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cgalutils.cc b/src/cgalutils.cc
index 15d880fa..c308a816 100644
--- a/src/cgalutils.cc
+++ b/src/cgalutils.cc
@@ -1180,7 +1180,7 @@ namespace CGALUtils {
 						int idx = allVertices.lookup(vector_convert<Vector3f>(p));
 						if (currface.empty() || idx != currface.back()) currface.push_back(idx);
 					}
-					if (currface.front() == currface.back()) currface.pop_back();
+					if (!currface.empty() && currface.front() == currface.back()) currface.pop_back();
 					if (currface.size() < 3) faces.pop_back(); // Cull empty triangles
 				}
 			}