diff --git a/src/main/java/eu/dnetlib/openaire/usermanagement/api/RegistryService.java b/src/main/java/eu/dnetlib/openaire/usermanagement/api/RegistryService.java
index 0131358..9c014a9 100644
--- a/src/main/java/eu/dnetlib/openaire/usermanagement/api/RegistryService.java
+++ b/src/main/java/eu/dnetlib/openaire/usermanagement/api/RegistryService.java
@@ -22,9 +22,7 @@ import javax.mail.MessagingException;
 import javax.ws.rs.*;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.List;
+import java.util.*;
 
 @Component(value = "RegistryService")
 @Path("/registry")
@@ -543,6 +541,10 @@ public class RegistryService {
                 JsonArray emails = calls.getUserEmailByCouId(couId, true);
                 JsonArray names = calls.getUserNamesByCouId(couId, true);
                 JsonUtils.mergeUserInfo(managers, emails, names, gson);
+            } else {
+                managers.forEach(user -> {
+                    user.getAsJsonObject().remove("coPersonId");
+                });
             }
             return Response.status(HttpStatus.OK.value()).entity(jsonUtils.createResponse(managers).toString()).type(MediaType.APPLICATION_JSON).build();
         } else {