From 12b12fa94105cefb086697ce7c6c6aeb418fa2e6 Mon Sep 17 00:00:00 2001
From: Uwe <donovaly@users.noreply.github.com>
Date: Sun, 12 Jun 2022 14:56:54 +0200
Subject: [PATCH] [FEM] fix crash with data point filter

- when the filter is upon another filter that e.g. clipped all data, we cannot access data
---
 src/Mod/Fem/App/FemPostFilter.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Mod/Fem/App/FemPostFilter.cpp b/src/Mod/Fem/App/FemPostFilter.cpp
index ce4edf9070..b51d0f23d6 100644
--- a/src/Mod/Fem/App/FemPostFilter.cpp
+++ b/src/Mod/Fem/App/FemPostFilter.cpp
@@ -404,6 +404,10 @@ void FemPostDataAtPointFilter::GetPointData() {
     vtkSmartPointer<vtkDataObject> data = m_probe->GetOutputDataObject(0);
     vtkDataSet* dset = vtkDataSet::SafeDownCast(data);
     vtkDataArray* pdata = dset->GetPointData()->GetArray(FieldName.getValue());
+    // VTK cannot deliver data when the filer relies e.g. on a scalar clip filter
+    // whose value is set so that all data are clipped
+    if (!pdata)
+        return;
 
     int component = 0;