diff --git a/dmp-backend/web/src/main/java/eu/eudat/logic/managers/InvitationsManager.java b/dmp-backend/web/src/main/java/eu/eudat/logic/managers/InvitationsManager.java
index 7a367f70f..7781f4e0a 100644
--- a/dmp-backend/web/src/main/java/eu/eudat/logic/managers/InvitationsManager.java
+++ b/dmp-backend/web/src/main/java/eu/eudat/logic/managers/InvitationsManager.java
@@ -82,7 +82,7 @@ public class InvitationsManager {
         Unmarshaller unmarshaller = context.createUnmarshaller();
         Properties properties = (Properties) unmarshaller.unmarshal(new StringReader(invitation.getProperties()));
         UserInfo invitedUser = apiContext.getOperationsContext().getDatabaseRepository().getUserInfoDao().find(principal.getId());
-        QueryableList<UserDMP> userDMPQueryableList = apiContext.getOperationsContext().getDatabaseRepository().getUserDmpDao().asQueryable().where(((builder, root) -> builder.and(builder.equal(root.get("dmp").get("id"), invitation.getDmp().getId()), builder.equal(root.get("user").get("id"), invitation.getUser().getId()))));
+        QueryableList<UserDMP> userDMPQueryableList = apiContext.getOperationsContext().getDatabaseRepository().getUserDmpDao().asQueryable().where(((builder, root) -> builder.and(builder.equal(root.get("dmp").get("id"), invitation.getDmp().getId()), builder.equal(root.get("user").get("id"), invitedUser.getId()))));
         UserDMP existingUserDMP = userDMPQueryableList.getSingleOrDefault();
         if (existingUserDMP != null) {
             if (properties.getRole() != null && existingUserDMP.getRole() > properties.getRole()) {