diff --git a/src/main/java/biz/netcentric/filevault/validator/DateProperty.java b/src/main/java/biz/netcentric/filevault/validator/DateProperty.java
index 668df5d..9c6f492 100644
--- a/src/main/java/biz/netcentric/filevault/validator/DateProperty.java
+++ b/src/main/java/biz/netcentric/filevault/validator/DateProperty.java
@@ -105,7 +105,7 @@ Optional<Map.Entry<Calendar, String>> extractDate(@NotNull DocViewNode2 node, Pr
         } else {
             // check for auto-created property
             Collection<String> types = new HashSet<>();
-            node.getPrimaryType().map(t -> types.add(t));
+            node.getPrimaryType().ifPresent(types::add);
             types.addAll(node.getMixinTypes());
             if (propertyName.getAutoCreatedTypes().stream().anyMatch(types::contains)) {
                 dateAndLabel = new SimpleEntry<>(Calendar.getInstance(), "auto created " + propertyName.getName().toString());