From 141c3bca53fe3a6b0be5067ce69fa2123794da5d Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 3 Jan 2020 14:24:53 +0100
Subject: [PATCH] fixes #0004158: FreeCAD crashes when deleting spline [skip
 ci]

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

diff --git a/src/Mod/PartDesign/App/FeaturePipe.cpp b/src/Mod/PartDesign/App/FeaturePipe.cpp
index ae41478b3d..3ee4f68a5d 100644
--- a/src/Mod/PartDesign/App/FeaturePipe.cpp
+++ b/src/Mod/PartDesign/App/FeaturePipe.cpp
@@ -225,6 +225,10 @@ App::DocumentObjectExecReturn *Pipe::execute(void)
             scalinglaw = s;
         }*/
 
+        // Verify that path is not a null shape
+        if (path.IsNull())
+            return new App::DocumentObjectExecReturn("Path must not be a null shape");
+
         //build all shells
         std::vector<TopoDS_Shape> shells;
         std::vector<TopoDS_Wire> frontwires, backwires;