diff --git a/libsrc/occ/python_occ_shapes.cpp b/libsrc/occ/python_occ_shapes.cpp
index 4aa2e040..f1c8e234 100644
--- a/libsrc/occ/python_occ_shapes.cpp
+++ b/libsrc/occ/python_occ_shapes.cpp
@@ -1187,6 +1187,7 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
            for (TopExp_Explorer e(shape, TopAbs_FACE); e.More(); e.Next())
            {
                TopoDS_Face face = TopoDS::Face(e.Current());
+               if(fmap.Contains(face)) continue;
                // Handle(TopoDS_Face) face = e.Current();
                fmap.Add(face);
                ExtractFaceData(face, index, p, n, box);
diff --git a/tests/dockerfile b/tests/dockerfile
index 8bb9919d..bc8186ae 100644
--- a/tests/dockerfile
+++ b/tests/dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:21.10
+FROM ubuntu:22.04
 ENV DEBIAN_FRONTEND=noninteractive
 MAINTAINER Matthias Hochsteger <matthias.hochsteger@tuwien.ac.at>
 RUN apt-get update && apt-get -y install \