From bbadcf614b9c3274e8cade7d547846fc6f6a2c8d Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 23 Dec 2016 15:36:01 +0100
Subject: [PATCH] clear nodes of fem view provider when clearing mesh

---
 src/Mod/Fem/Gui/ViewProviderFemMesh.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp b/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
index 14b238ca5..952ab2071 100644
--- a/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
+++ b/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
@@ -727,7 +727,12 @@ void ViewProviderFEMMeshBuilder::createMesh(const App::Property* prop,
     int numNodes = data->NbNodes();
     int numEdges = data->NbEdges();
 
-    if(numFaces+numNodes+numEdges == 0) return;
+    if (numFaces+numNodes+numEdges == 0) {
+        coords->point.setNum(0);
+        faces->coordIndex.setNum(0);
+        lines->coordIndex.setNum(0);
+        return;
+    }
     Base::TimeInfo Start;
     Base::Console().Log("Start: ViewProviderFEMMeshBuilder::createMesh() =================================\n");