diff --git a/bzst-dip-java-client/src/main/java/software/xdev/bzst/dip/client/model/message/BzstDipCorrectableReportableSellerType.java b/bzst-dip-java-client/src/main/java/software/xdev/bzst/dip/client/model/message/BzstDipCorrectableReportableSellerType.java
index 9f2151e3..19cbbea3 100644
--- a/bzst-dip-java-client/src/main/java/software/xdev/bzst/dip/client/model/message/BzstDipCorrectableReportableSellerType.java
+++ b/bzst-dip-java-client/src/main/java/software/xdev/bzst/dip/client/model/message/BzstDipCorrectableReportableSellerType.java
@@ -51,7 +51,7 @@ public CorrectableReportableSellerType toXmlType(final BzstDipConfiguration conf
 			this.vat,
 			this.firstName,
 			this.lastName,
-			this.birthDate.format(DateTimeFormatter.ISO_LOCAL_DATE),
+			this.birthDate == null ? "NULL" : this.birthDate.format(DateTimeFormatter.ISO_LOCAL_DATE),
 			this.legalAddress.toXmlType(),
 			this.addressFix.toXmlType(),
 			this.numberOfActivities.toXmlType(),