diff --git a/src/main/java/org/swmaestro/repl/gifthub/vouchers/service/VoucherService.java b/src/main/java/org/swmaestro/repl/gifthub/vouchers/service/VoucherService.java
index 5b435d79..ac4088ac 100644
--- a/src/main/java/org/swmaestro/repl/gifthub/vouchers/service/VoucherService.java
+++ b/src/main/java/org/swmaestro/repl/gifthub/vouchers/service/VoucherService.java
@@ -275,7 +275,8 @@ public VoucherReadResponseDto mapToDto(Voucher voucher) {
 	public boolean isDuplicateVoucher(String username, String barcode) {
 		List<Voucher> vouchers = voucherRepository.findAllByUserUsername(username);
 		for (Voucher voucher : vouchers) {
-			if (voucher.getBarcode().equals(barcode)) {
+			String voucherBarcode = voucher.getBarcode();
+			if (voucherBarcode != null && voucherBarcode.equals(barcode)) {
 				return true;
 			}
 		}