diff --git a/barker/barker/printing/bill.py b/barker/barker/printing/bill.py
index 6555eeb..fa06f5d 100644
--- a/barker/barker/printing/bill.py
+++ b/barker/barker/printing/bill.py
@@ -40,13 +40,15 @@ def print_bill(voucher_id: uuid.UUID, db: Session):
         key = (
             i.product_id,
             i.is_happy_hour,
-            tuple(m.modifier_id for m in i.modifiers if m.modifier.show_in_bill),
+            frozenset(m.modifier_id for m in i.modifiers if m.modifier.show_in_bill),
         )
         if key in items_dict:
             items_dict[key].quantity += i.quantity
+            i.quantity = 0
         else:
             items_dict[key] = i
 
+    for i in [it for it in items_dict.values() if it.quantity != 0]:
         get_tax_item(i.tax.id, i.tax.name, i.tax_amount, tax)
     data = design_bill(voucher, items_dict.values(), tax.values(), db)
     redis: ArqRedis = asyncio.run(create_pool(redis_settings))
diff --git a/barker/barker/routers/role.py b/barker/barker/routers/role.py
index 7929eeb..1eeb252 100644
--- a/barker/barker/routers/role.py
+++ b/barker/barker/routers/role.py
@@ -69,12 +69,12 @@ def delete_route(
     with SessionFuture() as db:
         if db.execute(select(count(user_roles.c.id)).where(user_roles.c.role_id == id_)).scalar_one() > 0:
             raise HTTPException(
-                status_code=status.HTTP_501_NOT_IMPLEMENTED,
+                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
                 detail="This Role has been assigned to users and cannot be deleted.",
             )
         if db.execute(select(count(role_permissions.c.id)).where(role_permissions.c.role_id == id_)).scalar_one() > 0:
             raise HTTPException(
-                status_code=status.HTTP_501_NOT_IMPLEMENTED,
+                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
                 detail="This Role has permissions and cannot be deleted.",
             )
         item: Role = db.execute(select(Role).where(Role.id == id_)).scalar_one()
diff --git a/barker/barker/routers/voucher/save.py b/barker/barker/routers/voucher/save.py
index 34caa24..6038669 100644
--- a/barker/barker/routers/voucher/save.py
+++ b/barker/barker/routers/voucher/save.py
@@ -55,9 +55,11 @@ def save(
             if update_table:
                 do_update_table(item, guest_book, db)
             db.commit()
-            print_kot(item.id, db)
+            voucher_id = item.id
+        with SessionFuture() as db:
+            print_kot(voucher_id, db)
             if item.voucher_type != VoucherType.KOT:
-                print_bill(item.id, db)
+                print_bill(voucher_id, db)
     except SQLAlchemyError as e:
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
diff --git a/barker/barker/routers/voucher/update.py b/barker/barker/routers/voucher/update.py
index bfc79e5..8e15ea7 100644
--- a/barker/barker/routers/voucher/update.py
+++ b/barker/barker/routers/voucher/update.py
@@ -169,10 +169,12 @@ def update_route(
             if update_table:
                 do_update_table(item, guest_book, db)
             db.commit()
+            voucher_id = item.id
+        with SessionFuture() as db:
             if need_to_print_kot:
-                print_kot(item.id, db)
+                print_kot(voucher_id, db)
             if item.voucher_type != VoucherType.KOT:
-                print_bill(item.id, db)
+                print_bill(voucher_id, db)
     except SQLAlchemyError as e:
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,