Fix: Error is checking length of bills

barker/barker/printing/bill.py

@@ -47,7 +47,7 @@ def print_bill(voucher_id: uuid.UUID, db: Session):
 
     loop = asyncio.new_event_loop()
     redis: ArqRedis = loop.run_until_complete(create_pool(redis_settings))
-    if len(bills > 1):
+    if len(bills) > 1:
         total = design_total(voucher, regimes, db)
         loop.run_until_complete(
             redis.enqueue_job(