diff --git a/layer3/MoleculeExporter.cpp b/layer3/MoleculeExporter.cpp
index 08f2d07ab..2b77b45e6 100644
--- a/layer3/MoleculeExporter.cpp
+++ b/layer3/MoleculeExporter.cpp
@@ -1821,7 +1821,7 @@ struct MoleculeExporterChemPy : public MoleculeExporter {
   void writeAtom() override {
     PyObject *atom = CoordSetAtomToChemPyAtom(G,
         m_iter.getAtomInfo(), m_last_obj, m_coord, getRefPtr(),
-        m_iter.getAtm(), m_mat_full.ptr);
+        m_iter.getAtm(), m_iter.obj);
 
     if (atom) {
       PyList_Append(m_atom_list, atom);
diff --git a/testing/tests/api/exporting.py b/testing/tests/api/exporting.py
index aebd815ae..90711bd82 100644
--- a/testing/tests/api/exporting.py
+++ b/testing/tests/api/exporting.py
@@ -353,8 +353,11 @@ def testGetModelObjectName(self):
         cmd.load(self.datafile('1rna.cif'))
 
         m1 = cmd.get_model()
+        cnt = cmd.count_atoms('%1oky-frag')
+
         self.assertEqual(m1.atom[0].model, '1oky-frag')
         self.assertEqual(m1.atom[-1].model, '1rna')
+        self.assertEqual(m1.atom[cnt].model, '1rna')
 
 
     @testing.requires_version('2.1')