From 062a8a28dfee9d833298732a6ea2513bace31ca7 Mon Sep 17 00:00:00 2001
From: Val Erastov <xibyte@gmail.com>
Date: Wed, 4 Nov 2015 20:19:37 -0800
Subject: [PATCH] fix bug

---
 web/app/3d/ctrl.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/web/app/3d/ctrl.js b/web/app/3d/ctrl.js
index d5790206..4243b1d9 100644
--- a/web/app/3d/ctrl.js
+++ b/web/app/3d/ctrl.js
@@ -134,7 +134,7 @@ TCAD.UI = function(app) {
     for (var i = 0; i < solids.length; i++) {
       for (var j = 0; j < solids[i].polyFaces.length; j++) {
         var face = solids[i].polyFaces[j];
-        face.sketch3DGroup.visible = enabled;
+        if (face.sketch3DGroup != null) face.sketch3DGroup.visible = enabled;
       }
     }
     app.viewer.render();