diff --git a/openvidu-server/src/main/java/io/openvidu/server/cdr/CallDetailRecord.java b/openvidu-server/src/main/java/io/openvidu/server/cdr/CallDetailRecord.java
index 3a97407d..dd3cf5a1 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/cdr/CallDetailRecord.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/cdr/CallDetailRecord.java
@@ -25,6 +25,8 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentSkipListSet;
 
 import org.kurento.client.GenericMediaEvent;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 
 import io.openvidu.java.client.Recording.Status;
@@ -91,6 +93,8 @@ import io.openvidu.server.webhook.CDRLoggerWebhook;
  */
 public class CallDetailRecord {
 
+	private static final Logger log = LoggerFactory.getLogger(CallDetailRecord.class);
+
 	@Autowired
 	private SessionManager sessionManager;
 
@@ -193,6 +197,8 @@ public class CallDetailRecord {
 							.get(participantPublicId).addSubscriberClosed(streamId, eventSubscriberEnd);
 				}
 			}
+		} else {
+			log.error("No subscriptions map in CDR for session participant {}", participantPublicId);
 		}
 	}