From 33225af265702609b42c652a493a0fae472e7647 Mon Sep 17 00:00:00 2001
From: Stewart Allen <sa@grid.space>
Date: Sun, 25 Jul 2021 13:32:31 -0400
Subject: [PATCH] fix empty slices errors

---
 src/mode/fdm/slice.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mode/fdm/slice.js b/src/mode/fdm/slice.js
index b4e39e5e..d69ed988 100644
--- a/src/mode/fdm/slice.js
+++ b/src/mode/fdm/slice.js
@@ -246,7 +246,7 @@
 
             widget.slices = slices;
 
-            if (!slices) {
+            if (!slices || slices.length === 0) {
                 return;
             }
 
@@ -370,7 +370,7 @@
                     }
                 }
                 // ensure we start against a layer with shells
-                while (start.up && start.topShells().length === 0) {
+                while (start && start.up && start.topShells().length === 0) {
                     start = start.up;
                 }
                 // if a brim applies, add that width to anchor