From 2779f0b29f9c0dcea62012594087090485a83734 Mon Sep 17 00:00:00 2001
From: Ajinkya Dahale <AjinkyaDahale@users.noreply.github.com>
Date: Fri, 14 Mar 2025 01:23:04 +0530
Subject: [PATCH] [Sketcher] Add missing check in `deriveConstraintsForPieces`

Fixes #19770.
---
 src/Mod/Sketcher/App/SketchObject.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
index ab509d5117..a39ce9c6e4 100644
--- a/src/Mod/Sketcher/App/SketchObject.cpp
+++ b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -4119,6 +4119,10 @@ bool SketchObject::deriveConstraintsForPieces(const int oldId,
             return true;
         }
 
+        if (conId == GeoEnum::GeoUndef) {
+            // nothing further to do
+            return false;
+        }
         Base::Vector3d conPoint(getPoint(conId, conPos));
         double conParam;
         auto* geoAsCurve = static_cast<const Part::GeomCurve*>(geo);