diff --git a/src/main/java/org/olat/modules/opencast/manager/client/GetEventsParams.java b/src/main/java/org/olat/modules/opencast/manager/client/GetEventsParams.java
index 16140fee126a0c70eada22c8e9c0cba89756c21c..5fc081111684a1e76759abc7f91cb86183afeb64 100644
--- a/src/main/java/org/olat/modules/opencast/manager/client/GetEventsParams.java
+++ b/src/main/java/org/olat/modules/opencast/manager/client/GetEventsParams.java
@@ -24,6 +24,7 @@ import java.util.Map;
 import java.util.stream.Collectors;
 
 import org.olat.modules.opencast.AuthDelegate;
+import org.olat.modules.opencast.AuthDelegate.Type;
 
 /**
  * 
@@ -33,6 +34,8 @@ import org.olat.modules.opencast.AuthDelegate;
  */
 public class GetEventsParams {
 	
+	private static final AuthDelegate AUTH_NONE = AuthDelegate.of(Type.None, null);
+	
 	public enum Filter {
 		title,
 		textFilter
@@ -47,7 +50,7 @@ public class GetEventsParams {
 	private String sortParam;
 	
 	private GetEventsParams(Builder builder) {
-		this.authDelegate = builder.authDelegate;
+		this.authDelegate = builder.authDelegate != null? builder.authDelegate: AUTH_NONE;
 		
 		if (builder.limit != null) {
 			this.limit = Integer.toString(builder.limit);
diff --git a/src/main/java/org/olat/modules/opencast/manager/client/GetSeriesParams.java b/src/main/java/org/olat/modules/opencast/manager/client/GetSeriesParams.java
index 2685924d0a33ce4ec95fbf058e986399f63fa4ae..dd1525d6fc8760df1f026ef92c8424c0c936a698 100644
--- a/src/main/java/org/olat/modules/opencast/manager/client/GetSeriesParams.java
+++ b/src/main/java/org/olat/modules/opencast/manager/client/GetSeriesParams.java
@@ -24,6 +24,7 @@ import java.util.Map;
 import java.util.stream.Collectors;
 
 import org.olat.modules.opencast.AuthDelegate;
+import org.olat.modules.opencast.AuthDelegate.Type;
 
 /**
  * 
@@ -33,6 +34,8 @@ import org.olat.modules.opencast.AuthDelegate;
  */
 public class GetSeriesParams {
 	
+	private static final AuthDelegate AUTH_NONE = AuthDelegate.of(Type.None, null);
+	
 	public enum Filter {
 		title,
 		textFilter
@@ -47,7 +50,7 @@ public class GetSeriesParams {
 	private String sortParam;
 	
 	private GetSeriesParams(Builder builder) {
-		this.authDelegate = builder.authDelegate;
+		this.authDelegate = builder.authDelegate != null? builder.authDelegate: AUTH_NONE;
 		
 		if (builder.limit != null) {
 			this.limit = Integer.toString(builder.limit);