diff --git a/gravitee-management-api-service/src/main/java/io/gravitee/management/service/impl/RatingServiceImpl.java b/gravitee-management-api-service/src/main/java/io/gravitee/management/service/impl/RatingServiceImpl.java
index 77e0778787..642667d028 100644
--- a/gravitee-management-api-service/src/main/java/io/gravitee/management/service/impl/RatingServiceImpl.java
+++ b/gravitee-management-api-service/src/main/java/io/gravitee/management/service/impl/RatingServiceImpl.java
@@ -284,7 +284,7 @@ private RatingEntity convert(final Rating rating) {
         if (user.getFirstname() != null && user.getLastname() != null) {
             ratingEntity.setUserDisplayName(user.getFirstname() + ' ' + user.getLastname());
         } else {
-            ratingEntity.setUserDisplayName(user.getEmail());
+            ratingEntity.setUserDisplayName(user.getEmail() == null ? user.getSourceId() : user.getEmail());
         }
 
         ratingEntity.setId(rating.getId());