..

python/parpe/hdf5_pe_input.py

@@ -360,7 +360,7 @@ def _generate_simulation_to_optimization_parameter_mapping(self) -> None:
                     in enumerate(variable_par_ids):
                 mapped_parameter = cond_par_map.map_sim_var[model_parameter_id]
                 while ((maps_to := cond_par_map.map_sim_var.get(mapped_parameter, mapped_parameter)) != mapped_parameter
-                       and not np.isnan(maps_to)):
+                       and isinstance(maps_to, str)):
                     mapped_parameter = maps_to
                 try:
                     (mapped_idx, override) = self.get_index_mapping_for_par(