From 3c19539dc92def2445f6800451c806ed6d9b41c5 Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Tue, 16 Feb 2021 22:06:54 -0500
Subject: [PATCH] fix access to missing field

---
 src/mode/fdm/prepare.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mode/fdm/prepare.js b/src/mode/fdm/prepare.js
index 48c07e40..e6f5ee92 100644
--- a/src/mode/fdm/prepare.js
+++ b/src/mode/fdm/prepare.js
@@ -411,7 +411,7 @@
                         params, // range parameters
                         first: slice.index === 0,
                         support: slice.widget.support,
-                        onBelt: slice.belt.touch,
+                        onBelt: slice.belt && slice.belt.touch,
                         pretract: (wipeDist) => {
                             if (lastLayer && lastLayer.length) {
                                 let lastOut = lastLayer.last();