From 9f7734abeb74298d91864feff77ae11b1d791c43 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sat, 26 Jul 2014 17:15:47 +0200
Subject: [PATCH] Prevent warnings when zooming on uninitialized 3D canvas

---
 lib/Slic3r/GUI/PreviewCanvas.pm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/Slic3r/GUI/PreviewCanvas.pm b/lib/Slic3r/GUI/PreviewCanvas.pm
index cbc6cbbe4..89967922c 100644
--- a/lib/Slic3r/GUI/PreviewCanvas.pm
+++ b/lib/Slic3r/GUI/PreviewCanvas.pm
@@ -379,6 +379,7 @@ sub mouse_to_3d {
 sub ZoomTo {
     my ($self, $factor, $tox, $toy) =  @_;
     
+    return if !$self->init;
     glTranslatef($tox, $toy, 0);
     glMatrixMode(GL_MODELVIEW);
     $self->Zoom($factor);