From 115d70e06076b7db7b1bbb6177edbb8b1c46cabb Mon Sep 17 00:00:00 2001
From: Maciej Suminski <maciej.suminski@cern.ch>
Date: Thu, 29 Sep 2016 15:34:08 +0200
Subject: [PATCH] Fixed a crash when drawing a single point polyline

---
 common/gal/opengl/opengl_gal.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/common/gal/opengl/opengl_gal.cpp b/common/gal/opengl/opengl_gal.cpp
index 1f2eab7e36..945161ff05 100644
--- a/common/gal/opengl/opengl_gal.cpp
+++ b/common/gal/opengl/opengl_gal.cpp
@@ -450,7 +450,7 @@ void OPENGL_GAL::DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEn
 
 void OPENGL_GAL::DrawPolyline( const std::deque<VECTOR2D>& aPointList )
 {
-    if( aPointList.empty() )
+    if( aPointList.size() < 2 )
         return;
 
     currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );
@@ -478,6 +478,9 @@ void OPENGL_GAL::DrawPolyline( const std::deque<VECTOR2D>& aPointList )
 
 void OPENGL_GAL::DrawPolyline( const VECTOR2D aPointList[], int aListSize )
 {
+    if( aListSize < 2 )
+        return;
+
     currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );
 
     // Start from the second point