diff --git a/src/aiidalab_qe_vibroscopy/app/result/result.py b/src/aiidalab_qe_vibroscopy/app/result/result.py
index 8ad8d69..3ce1ccd 100644
--- a/src/aiidalab_qe_vibroscopy/app/result/result.py
+++ b/src/aiidalab_qe_vibroscopy/app/result/result.py
@@ -46,7 +46,7 @@ def render(self):
 
         needs_phonons_tab = self._model.needs_phonons_tab()
         if needs_phonons_tab:
-            vibroscopy_node = self._model._fetch_child_process_node()
+            vibroscopy_node = self._model.fetch_child_process_node()
             phonon_model = PhononModel()
             phonon_widget = PhononWidget(
                 model=phonon_model,
@@ -56,7 +56,7 @@ def render(self):
 
         needs_raman_tab = self._model.needs_raman_tab()
         if needs_raman_tab:
-            vibroscopy_node = self._model._fetch_child_process_node()
+            vibroscopy_node = self._model.fetch_child_process_node()
             input_structure = vibroscopy_node.inputs.structure.get_ase()
             irraman_model = IRRamanModel()
             irraman_widget = IRRamanWidget(