billing self-service
diff --git a/services/self-service/src/main/java/com/epam/dlab/backendapi/dao/BaseBillingDAO.java b/services/self-service/src/main/java/com/epam/dlab/backendapi/dao/BaseBillingDAO.java
index 37d1726..189a282 100644
--- a/services/self-service/src/main/java/com/epam/dlab/backendapi/dao/BaseBillingDAO.java
+++ b/services/self-service/src/main/java/com/epam/dlab/backendapi/dao/BaseBillingDAO.java
@@ -158,7 +158,9 @@
 
 	@Override
 	public void save(List<BillingReportLine> billingData) {
-		insertMany(BILLING, new ArrayList<>(billingData));
+		if (CollectionUtils.isNotEmpty(billingData)) {
+			insertMany(BILLING, new ArrayList<>(billingData));
+		}
 	}
 
 	private Integer toPercentage(Supplier<Optional<Integer>> allowedBudget, Double totalCost) {