From 57ed55ca77dbb8270a3e0f392a10d8aca4f9128c Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Tue, 9 Sep 2025 16:31:48 -0400
Subject: [PATCH] fixes #423

---
 src/kiri/run/engine.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/kiri/run/engine.js b/src/kiri/run/engine.js
index 00824cbe..5b9d7008 100644
--- a/src/kiri/run/engine.js
+++ b/src/kiri/run/engine.js
@@ -156,7 +156,7 @@ class Engine {
     }
 
     slice() {
-        this.widget.setTopZ(this.settings.stock.z - (this.topOffset || 0));
+        this.widget.setTopZ((this.settings?.stock?.z || 0) - (this.topOffset || 0));
         return new Promise((accept, reject) => {
             client.clear();
             client.sync([this.widget]);