diff --git a/openvidu-test-browsers/src/main/java/io/openvidu/test/browsers/utils/webhook/CustomWebhook.java b/openvidu-test-browsers/src/main/java/io/openvidu/test/browsers/utils/webhook/CustomWebhook.java
index b2ed7207..d2589646 100644
--- a/openvidu-test-browsers/src/main/java/io/openvidu/test/browsers/utils/webhook/CustomWebhook.java
+++ b/openvidu-test-browsers/src/main/java/io/openvidu/test/browsers/utils/webhook/CustomWebhook.java
@@ -66,14 +66,14 @@ public class CustomWebhook {
 		CustomWebhook.context.close();
 	}
 
-	public static void clean() {
+	public synchronized static void clean() {
 		CustomWebhook.accumulatedNumberOfEvents = 0;
 		CustomWebhook.accumulatedEvents.clear();
 		CustomWebhook.eventsInOrder.clear();
 		CustomWebhook.events.clear();
 	}
 
-	public static void cleanEventsInOrder() {
+	public synchronized static void cleanEventsInOrder() {
 		CustomWebhook.eventsInOrder.clear();
 	}