From 049859e5b12677318c88b32129a6da2fca5b6537 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sat, 22 Nov 2014 19:42:35 +0100
Subject: [PATCH] Fixed minor regression in plater 2D canvas

---
 lib/Slic3r/GUI/Plater/2D.pm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Slic3r/GUI/Plater/2D.pm b/lib/Slic3r/GUI/Plater/2D.pm
index b3514c4914..e845cbe9a7 100644
--- a/lib/Slic3r/GUI/Plater/2D.pm
+++ b/lib/Slic3r/GUI/Plater/2D.pm
@@ -211,7 +211,8 @@ sub mouse_event {
         }
         $self->Refresh;
     } elsif ($event->ButtonUp(&Wx::wxMOUSE_BTN_LEFT)) {
-        $self->{on_instance_moved}->(@{ $self->{drag_object} });
+        $self->{on_instance_moved}->(@{ $self->{drag_object} })
+            if $self->{drag_object};
         $self->Refresh;
         $self->{drag_start_pos} = undef;
         $self->{drag_object} = undef;