diff --git a/openvidu-server/src/main/java/io/openvidu/server/kurento/core/KurentoSessionManager.java b/openvidu-server/src/main/java/io/openvidu/server/kurento/core/KurentoSessionManager.java
index 317638fe..dc8acb6d 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/kurento/core/KurentoSessionManager.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/kurento/core/KurentoSessionManager.java
@@ -35,6 +35,7 @@ import javax.annotation.PreDestroy;
 
 import org.apache.commons.lang3.RandomStringUtils;
 import org.kurento.client.GenericMediaElement;
+import org.kurento.client.GenericMediaEvent;
 import org.kurento.client.IceCandidate;
 import org.kurento.client.ListenerSubscription;
 import org.kurento.client.PassThrough;
@@ -1355,7 +1356,7 @@ public class KurentoSessionManager extends SessionManager {
 					sessionEventsHandler.onFilterEventDispatched(sessionId, uniqueSessionId, connectionId, streamId,
 							filterType, event, kParticipant.getSession().getParticipants(),
 							kParticipant.getPublisher().getPartipantsListentingToFilterEvent(eventType));
-				});
+				}, GenericMediaEvent.class);
 				pub.storeListener(eventType, listener);
 			} catch (Exception e) {
 				log.error("Request to addFilterEventListener to stream {} gone wrong. Error: {}", streamId,
diff --git a/openvidu-server/src/main/java/io/openvidu/server/kurento/endpoint/PublisherEndpoint.java b/openvidu-server/src/main/java/io/openvidu/server/kurento/endpoint/PublisherEndpoint.java
index d2652417..26ec0054 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/kurento/endpoint/PublisherEndpoint.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/kurento/endpoint/PublisherEndpoint.java
@@ -353,7 +353,7 @@ public class PublisherEndpoint extends MediaEndpoint {
 
 	public JsonElement execMethod(String method, JsonObject params) throws OpenViduException {
 		Props props = new JsonUtils().fromJsonObjectToProps(params);
-		return (JsonElement) ((GenericMediaElement) this.filter).invoke(method, props);
+		return (JsonElement) ((GenericMediaElement) this.filter).invoke(method, props, JsonElement.class);
 	}
 
 	public synchronized void mute(TrackType muteType) {