diff --git a/activitysim/abm/models/util/logsums.py b/activitysim/abm/models/util/logsums.py
index a13b34344..cb173f994 100644
--- a/activitysim/abm/models/util/logsums.py
+++ b/activitysim/abm/models/util/logsums.py
@@ -167,7 +167,8 @@ def compute_location_choice_logsums(
     )
 
     nest_spec = config.get_logit_model_settings(logsum_settings)
-    nest_spec = simulate.eval_nest_coefficients(nest_spec, coefficients, trace_label)
+    if nest_spec is not None: # nest_spec is None for MNL
+        nest_spec = simulate.eval_nest_coefficients(nest_spec, coefficients, trace_label)
 
     locals_dict = {}
     # model_constants can appear in expressions