diff --git a/server/routers/booking/output.ts b/server/routers/booking/output.ts
index 88c0ea40f..4fb2bf8f7 100644
--- a/server/routers/booking/output.ts
+++ b/server/routers/booking/output.ts
@@ -101,10 +101,16 @@ const packageSchema = z
     unitPrice: packageData.price.unitPrice,
   }))
 
-const ancillarySchema = z.object({
-  comment: z.string().default(""),
-  deliveryTime: z.string().default(""),
-})
+const ancillarySchema = z
+  .object({
+    comment: z.string().default(""),
+    deliveryTime: z.string().default(""),
+  })
+  .nullable()
+  .default({
+    comment: "",
+    deliveryTime: "",
+  })
 
 const rateDefinitionSchema = z.object({
   breakfastIncluded: z.boolean().default(false),