diff --git a/openvidu-server/src/main/java/io/openvidu/server/rpc/RpcNotificationService.java b/openvidu-server/src/main/java/io/openvidu/server/rpc/RpcNotificationService.java
index 670f7b67..a197d4de 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/rpc/RpcNotificationService.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/rpc/RpcNotificationService.java
@@ -75,8 +75,7 @@ public class RpcNotificationService {
 		try {
 			t.sendResponse(result);
 		} catch (KurentoException e) {
-			if (e.getCause().getMessage()
-					.contains("been closed and no method (apart from close()) may be called on a closed session")) {
+			if (e.getCause().getClass().equals(java.lang.IllegalStateException.class)) {
 				log.warn("Response couldn't be sent to participant with privateId {}: {}", participantPrivateId,
 						e.getCause().getMessage());
 			} else {
@@ -119,8 +118,7 @@ public class RpcNotificationService {
 		try {
 			s.sendNotification(method, params);
 		} catch (KurentoException e) {
-			if (e.getCause().getMessage()
-					.contains("been closed and no method (apart from close()) may be called on a closed session")) {
+			if (e.getCause().getClass().equals(java.lang.IllegalStateException.class)) {
 				log.warn("Notification '{}' couldn't be sent to participant with privateId {}: {}", method,
 						participantPrivateId, e.getCause().getMessage());
 			} else {