From 4078bb0476c8556124790171b753316ab8a5e939 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Thu, 6 Dec 2012 10:54:28 +0100
Subject: [PATCH] Fix error when vibration limit is disabled

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

diff --git a/lib/Slic3r/GCode.pm b/lib/Slic3r/GCode.pm
index a5c46b2ea..6a45b61cc 100644
--- a/lib/Slic3r/GCode.pm
+++ b/lib/Slic3r/GCode.pm
@@ -514,7 +514,7 @@ sub _limit_frequency {
     my $self = shift;
     my ($point) = @_;
     
-    return if $Slic3r::Config->vibration_limit == 0;
+    return '' if $Slic3r::Config->vibration_limit == 0;
     my $min_time = 1 / ($Slic3r::Config->vibration_limit * 60);  # in minutes
     
     # calculate the move vector and move direction