diff --git a/playground/dan/pizza-palace/payment_type-schema.json b/playground/dan/pizza-palace/payment_type-schema.json
index dc1b9826..f83c14e7 100644
--- a/playground/dan/pizza-palace/payment_type-schema.json
+++ b/playground/dan/pizza-palace/payment_type-schema.json
@@ -6,7 +6,7 @@
       "title": "Please select a payment type",
       "type": "string",
       "anyOf": [
-        "creditcard",  
+        "creditcard", "" 
       ]
     }
   }