fix nullability annotation for user id
diff --git a/src/main/java/org/apache/sling/clam/result/internal/ResourcePersistingScanResultHandler.java b/src/main/java/org/apache/sling/clam/result/internal/ResourcePersistingScanResultHandler.java
index 6b6ac2e..40b06d8 100644
--- a/src/main/java/org/apache/sling/clam/result/internal/ResourcePersistingScanResultHandler.java
+++ b/src/main/java/org/apache/sling/clam/result/internal/ResourcePersistingScanResultHandler.java
@@ -117,7 +117,7 @@
     }
 
     @Override
-    public void handleJcrPropertyScanResult(@NotNull ScanResult scanResult, @NotNull String path, int propertyType, @NotNull String userId) {
+    public void handleJcrPropertyScanResult(@NotNull ScanResult scanResult, @NotNull String path, int propertyType, @Nullable String userId) {
         if (checkPersist(scanResult)) {
             persistResult(scanResult, path, null, propertyType, userId);
         }