From 900ee41d0ff7bc3995cec014d4f59a3d06c384d1 Mon Sep 17 00:00:00 2001
From: Ryan Di <ryan.weihao.di@gmail.com>
Date: Fri, 25 Apr 2025 11:09:18 +1000
Subject: [PATCH] fix elbow segment indexing

---
 packages/excalidraw/components/ShapeSwitch.tsx | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/packages/excalidraw/components/ShapeSwitch.tsx b/packages/excalidraw/components/ShapeSwitch.tsx
index 2c78d8b57..2f792ef4f 100644
--- a/packages/excalidraw/components/ShapeSwitch.tsx
+++ b/packages/excalidraw/components/ShapeSwitch.tsx
@@ -583,17 +583,18 @@ export const switchShapes = (
 
         if (isElbowArrow(element)) {
           const nextPoints = convertLineToElbow(element);
-
+          if (nextPoints.length < 2) {
+            // skip if not enough points to form valid segments
+            continue;
+          }
           const fixedSegments: FixedSegment[] = [];
-
           for (let i = 0; i < nextPoints.length - 1; i++) {
             fixedSegments.push({
               start: nextPoints[i],
               end: nextPoints[i + 1],
-              index: i,
+              index: i + 1,
             });
           }
-
           const updates = updateElbowArrowPoints(
             element,
             app.scene.getNonDeletedElementsMap(),