diff --git a/pycardano/utils.py b/pycardano/utils.py
index 036b5019..d486e8f0 100644
--- a/pycardano/utils.py
+++ b/pycardano/utils.py
@@ -247,6 +247,7 @@ def script_data_hash(
     """
     if not redeemers:
         cost_models = {}
+        redeemers = {}
     elif not cost_models:
         cost_models = COST_MODELS