diff --git a/src/transaction/transaction.service.ts b/src/transaction/transaction.service.ts
index 42e7a4e..d28c023 100644
--- a/src/transaction/transaction.service.ts
+++ b/src/transaction/transaction.service.ts
@@ -481,7 +481,7 @@ export class TransactionService {
       `${coaType[coaType.SALES]}-SYSTEM`,
     );
 
-    if (orderTransactionDto.bill_trx_id !== null) {
+    if (orderTransactionDto.bill_trx_id) {
       try {
         const billId = await this.checkBillHistoryRepository.findOneOrFail({
           where: {