From 2aa8f133f3eb3f03fefc360bf2ee26a3772a7cfb Mon Sep 17 00:00:00 2001
From: PaddleStroke <pierrelouis.boyer@gmail.com>
Date: Wed, 24 Sep 2025 11:41:46 +0200
Subject: [PATCH] Sketcher: Fix crash on constraint selection

---
 src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp b/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp
index b99c192650..a5a135fee7 100644
--- a/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp
+++ b/src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp
@@ -353,6 +353,10 @@ bool isCommandNeedingBSplineKnotActive(Gui::Document* doc)
         PointPos posId {PointPos::none};
         getIdsFromName(name, Obj, geoId, posId);
 
+        if (geoId == GeoEnum::GeoUndef) {
+            return false;
+        }
+
         int splineGeoId {GeoEnum::GeoUndef};
         int knotIndexOCC {-1};