diff --git a/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java b/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java
index 4ce000e..666536b 100644
--- a/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java
+++ b/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java
@@ -704,8 +704,8 @@ public class RepositoryServiceImpl implements RepositoryService {
 
         RequestFilter requestFilter = new RequestFilter();
         requestFilter.setRegisteredby(userEmail);
-        Object result = restTemplate.postForObject(uriComponents.toUri(), requestFilter, String[].class);
-        return (result != null) ? Collections.singletonList(result.toString()) : null;
+        String[] result = restTemplate.postForObject(uriComponents.toUri(), requestFilter, String[].class);
+        return (result != null) ? Arrays.asList(result) : null;
     }
 
     private Vocabulary getVocabulary(String vocName) {