From 91e9f651b51e6288e3f2678c00149d69ca3706a3 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sat, 22 Sep 2012 15:51:18 +0200
Subject: [PATCH] Bugfix: --avoid-crossing-perimeters was crashing when
 processing empty layers

---
 lib/Slic3r/GCode/MotionPlanner.pm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Slic3r/GCode/MotionPlanner.pm b/lib/Slic3r/GCode/MotionPlanner.pm
index 4957f4345..7bd84b4fc 100644
--- a/lib/Slic3r/GCode/MotionPlanner.pm
+++ b/lib/Slic3r/GCode/MotionPlanner.pm
@@ -224,6 +224,8 @@ sub shortest_path {
     my $self = shift;
     my ($from, $to) = @_;
     
+    return Slic3r::Polyline->new($from, $to) if !@{$self->islands};
+    
     # find nearest nodes
     my $new_from = $self->find_node($from, $to);
     my $new_to = $self->find_node($to, $from);