diff --git a/target_s3_parquet/data_type_generator.py b/target_s3_parquet/data_type_generator.py
index f7e035b..8dfc94c 100644
--- a/target_s3_parquet/data_type_generator.py
+++ b/target_s3_parquet/data_type_generator.py
@@ -55,7 +55,7 @@ def generate_tap_schema(schema, level=0, only_string=False):
 
         if cleaned_type == "object":
             field_definitions[name] = build_struct_type(
-                attributes["properties"], new_level
+                attributes.get("properties", {}), new_level
             )
         elif cleaned_type == "array":
             array_type = get_valid_types(attributes["items"]["type"])