diff --git a/pom.xml b/pom.xml
index d8ece81..30d4993 100644
--- a/pom.xml
+++ b/pom.xml
@@ -11,7 +11,7 @@
   </parent>
   <groupId>life.qbic</groupId>
   <artifactId>data-processing</artifactId>
-  <version>0.3.0</version>
+  <version>0.3.2</version>
   <name>data processing</name>
   <description>A Java tool that scans file move events and triggers a cascade of dataset
     pre-processing
diff --git a/src/main/java/life/qbic/data/processing/scanner/Scanner.java b/src/main/java/life/qbic/data/processing/scanner/Scanner.java
index c3b6f0a..33e358a 100644
--- a/src/main/java/life/qbic/data/processing/scanner/Scanner.java
+++ b/src/main/java/life/qbic/data/processing/scanner/Scanner.java
@@ -104,8 +104,16 @@ private List<RegistrationRequest> detectDataForRegistration() {
         .map(Path::toFile)
         .filter(this::matchesAccessRightsCriteria)
         .filter(this::matchesRegistrationCriteria)
-        .map(file -> createRequests(file.listFiles(), file.toPath())).flatMap(
-            Collection::stream).toList();
+        .map(processDir -> createRequests(
+            applyFilterForProcessDir(processDir.listFiles()),
+            processDir.toPath()))
+        .flatMap(Collection::stream).toList();
+  }
+
+  private File[] applyFilterForProcessDir(File[] processDirContent) {
+    return Arrays.stream(Objects.requireNonNull(processDirContent))
+        .filter(this::matchesAccessRightsCriteria)
+        .filter(this::matchesRegistrationCriteria).toArray(File[]::new);
   }
 
   private boolean matchesAccessRightsCriteria(File file) {