diff --git a/barker/barker/routers/voucher/update.py b/barker/barker/routers/voucher/update.py
index 0eba262..5c7b37b 100644
--- a/barker/barker/routers/voucher/update.py
+++ b/barker/barker/routers/voucher/update.py
@@ -56,11 +56,11 @@ def update_route(
             voucher_type = VoucherType(p)
             guest_book = get_guest_book(g, db)
             need_to_print_kot = False
-
             item: Voucher = db.execute(select(Voucher).where(Voucher.id == id_)).scalar_one()
 
             check_permissions(item, voucher_type, user.permissions)
 
+            item.pax = data.pax
             if guest_book is not None:
                 item.pax = guest_book.pax
             item.food_table_id = data.table.id_
@@ -91,6 +91,11 @@ def update_route(
                     iki.discount = next(
                         round(inv.discount, 5) for ko in data.kots for inv in ko.inventories if inv.id_ == iki.id
                     )
+            for dk in data.kots:
+                # Filter out nil inventories
+                dk.inventories = [dki for dki in dk.inventories if round(dki.quantity, 2) != 0]
+            # Filter out nil kots
+            data.kots = [k for k in data.kots if len(k.inventories) > 0]
             for dk in data.kots:
                 if happy_hour_has_discount(dk.inventories):
                     raise HTTPException(
@@ -102,19 +107,15 @@ def update_route(
                         status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
                         detail="Happy hour products are not balanced.",
                     )
-            for nk in (
-                dk
-                for dk in data.kots
-                if dk.id_ is None and len([dki for dki in dk.inventories if round(dki.quantity, 2) != 0]) > 0
-            ):
+            for nk in data.kots:
+                if nk.id_ is not None:
+                    continue
                 need_to_print_kot = True
                 code = db.execute(select(func.coalesce(func.max(Kot.code), 0) + 1)).scalar_one()
                 kot = Kot(item.id, code, item.food_table_id, now, item.user_id)
                 item.kots.append(kot)
                 db.add(kot)
                 for index, nki in enumerate(nk.inventories):
-                    if round(nki.quantity, 2) == 0:
-                        continue
                     product: ProductVersion = db.execute(
                         select(ProductVersion).where(
                             and_(
@@ -156,15 +157,15 @@ def update_route(
                             )
                     tax_rate = get_tax(product.sale_category.tax.rate, voucher_type)
                     inv = Inventory(
-                        kot.id,
-                        product.product_id,
-                        round(nki.quantity, 2),
-                        product.price,
-                        round(min(nki.discount, product.sale_category.discount_limit), 5),
-                        nki.is_happy_hour,
-                        product.sale_category.tax_id,
-                        tax_rate,
-                        index,
+                        kot_id=kot.id,
+                        product_id=product.product_id,
+                        quantity=round(nki.quantity, 2),
+                        price=product.price,
+                        discount=round(min(nki.discount, product.sale_category.discount_limit), 5),
+                        is_hh=nki.is_happy_hour,
+                        tax_rate=tax_rate,
+                        sort_order=index,
+                        tax=product.sale_category.tax,
                     )
                     kot.inventories.append(inv)
                     db.add(inv)