From b422537cc493d2eabd8cfcbfa30ab45b88c1d5da Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Thu, 15 Dec 2011 20:36:46 +0100
Subject: [PATCH] Bugfix: do not die when no layers are detected at all

---
 lib/Slic3r/Print.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index 552e92002..0b3587432 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -129,7 +129,7 @@ sub new_from_mesh {
     }
     
     # remove empty layers from bottom
-    while (!@{$print->layers->[0]->slices}) {
+    while (@{$print->layers} && !@{$print->layers->[0]->slices}) {
         shift @{$print->layers};
         for (my $i = 0; $i <= $#{$print->layers}; $i++) {
             $print->layers->[$i]->id($i);