diff --git a/etl/customers/stonewater/Wave 3 Preparation.py b/etl/customers/stonewater/Wave 3 Preparation.py
index 1973cbd8..84d67f56 100644
--- a/etl/customers/stonewater/Wave 3 Preparation.py	
+++ b/etl/customers/stonewater/Wave 3 Preparation.py	
@@ -472,7 +472,8 @@ def extract_epr(pdf_path):
         if data["Existing Secondary Heating System"] == "":
             data["Secondary Heating Code"] = ""
         else:
-            data["Secondary Heating Code"] = secondary_heating_code_match.group(1).strip()
+            data["Secondary Heating Code"] = secondary_heating_code_match.group(
+                1).strip() if secondary_heating_code_match else ""
         data["Water Heating Code"] = water_heating_code_match.group(1).strip()
 
         # Extract Windows information