From 56051b83bc71aeca1bc52263dd7ac6abd8af7a80 Mon Sep 17 00:00:00 2001
From: PaddleStroke <pierrelouis.boyer@gmail.com>
Date: Wed, 13 Mar 2024 14:48:59 +0100
Subject: [PATCH] Assembly: Remove bad joints : joints between a part and
 itself. Fixes #12752

---
 src/Mod/Assembly/App/AssemblyObject.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Assembly/App/AssemblyObject.cpp b/src/Mod/Assembly/App/AssemblyObject.cpp
index a88c1c8ce3..3ca1b7e60a 100644
--- a/src/Mod/Assembly/App/AssemblyObject.cpp
+++ b/src/Mod/Assembly/App/AssemblyObject.cpp
@@ -419,8 +419,11 @@ std::vector<App::DocumentObject*> AssemblyObject::getJoints(bool updateJCS, bool
             continue;
         }
 
-        if (!getLinkObjFromProp(joint, "Part1") || !getLinkObjFromProp(joint, "Part2")) {
+        auto* part1 = getLinkObjFromProp(joint, "Part1");
+        auto* part2 = getLinkObjFromProp(joint, "Part2");
+        if (!part1 || !part2 || part1->getFullName() == part2->getFullName()) {
             // Remove incomplete joints. Left-over when the user delets a part.
+            // Remove incoherent joints (self-pointing joints)
             if (delBadJoints) {
                 getDocument()->removeObject(joint->getNameInDocument());
             }