From 183c110ed93c0c47f2b97f2cbe588dea6281b978 Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Tue, 14 Oct 2025 21:00:00 -0400
Subject: [PATCH] fix fan setting for empty bridge layers

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

diff --git a/src/kiri/mode/fdm/prepare.js b/src/kiri/mode/fdm/prepare.js
index 301d47fb..7152f12a 100644
--- a/src/kiri/mode/fdm/prepare.js
+++ b/src/kiri/mode/fdm/prepare.js
@@ -1617,7 +1617,7 @@ function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
     print.addPrintPoints(preout, output);
 
     // bridge layer fan change
-    if (slice.isBridgeLayer) {
+    if (preout.length && slice.isBridgeLayer) {
         preout[0].fan = Math.round(fanSpeed / 3);
         preout.peek().fan = fanSpeed;
     }