From b2ca86d8d72b636011a73394bf9bcdedb3b109b7 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 26 Feb 2021 08:11:16 +0100
Subject: [PATCH] FEM: [skip ci] fix crash in Constraint::getDirection

---
 src/Mod/Fem/App/FemConstraint.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Mod/Fem/App/FemConstraint.cpp b/src/Mod/Fem/App/FemConstraint.cpp
index 4e77962533..18f72e87d2 100644
--- a/src/Mod/Fem/App/FemConstraint.cpp
+++ b/src/Mod/Fem/App/FemConstraint.cpp
@@ -432,6 +432,10 @@ Base::Vector3d Constraint::getBasePoint(const Base::Vector3d& base, const Base::
 const Base::Vector3d Constraint::getDirection(const App::PropertyLinkSub &direction)
 {
     App::DocumentObject* obj = direction.getValue();
+    if (!obj) {
+        return Base::Vector3d(0,0,0);
+    }
+
     if (obj->getTypeId().isDerivedFrom(App::Line::getClassTypeId())) {
         Base::Vector3d vec(1.0, 0.0, 0.0);
         static_cast<App::Line*>(obj)->Placement.getValue().multVec(vec, vec);