From cc275707042c0e1aa8c8c7be6e1e0dc63b8a2556 Mon Sep 17 00:00:00 2001
From: Lukas Matena <lukasmatena@seznam.cz>
Date: Wed, 31 Oct 2018 12:23:26 +0100
Subject: [PATCH] Fixed a crash when moving an object with wipe tower volume on
 screen

---
 src/slic3r/GUI/GLCanvas3D.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index e337916819..afa2ee9911 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -6744,10 +6744,10 @@ void GLCanvas3D::_on_move()
         if (done.find(done_id) != done.end())
             continue;
 
-        done.insert(done_id);
-
         if (object_idx < 1000)
         {
+            done.insert(done_id);
+
             // Move instances.
             ModelObject* model_object = m_model->objects[object_idx];
             if (model_object != nullptr)