diff --git a/zen_garden/model/objects/technology/conversion_technology.py b/zen_garden/model/objects/technology/conversion_technology.py
index 149a4b264..959c207f0 100644
--- a/zen_garden/model/objects/technology/conversion_technology.py
+++ b/zen_garden/model/objects/technology/conversion_technology.py
@@ -136,9 +136,9 @@ def get_capex_all_elements(cls, optimization_setup, index_names=None):
             # extract for pwa
             if not getattr(element, is_pwa_attribute):
                 dict_of_attributes, _, dict_of_units = optimization_setup.append_attribute_of_element_to_dict(element, attribute_name_linear, dict_of_attributes, dict_of_units={})
-            if not dict_of_attributes:
-                _, index_names = cls.create_custom_set(index_names, optimization_setup)
-                return dict_of_attributes, index_names, dict_of_units
+        if not dict_of_attributes:
+            _, index_names = cls.create_custom_set(index_names, optimization_setup)
+            return dict_of_attributes, index_names, dict_of_units
         dict_of_attributes = pd.concat(dict_of_attributes, keys=dict_of_attributes.keys())
         if not index_names:
             logging.warning(f"Initializing the parameter capex without the specifying the index names will be deprecated!")