diff --git a/dmp-backend/web/src/main/java/eu/eudat/logic/proxy/fetching/RemoteFetcherUtils.java b/dmp-backend/web/src/main/java/eu/eudat/logic/proxy/fetching/RemoteFetcherUtils.java
index 20c57356d..6b703ed15 100644
--- a/dmp-backend/web/src/main/java/eu/eudat/logic/proxy/fetching/RemoteFetcherUtils.java
+++ b/dmp-backend/web/src/main/java/eu/eudat/logic/proxy/fetching/RemoteFetcherUtils.java
@@ -70,7 +70,13 @@ public class RemoteFetcherUtils {
                             Object pidObj = stringObjectMap.get(value.split("\\.")[0]);
                             if(pidObj != null){
                                 if(pidObj instanceof Map){
-                                    pid = ((Map<String, String>) pidObj).get(value.split("\\.")[1]);
+                                    Object o = ((Map<String, Object>) pidObj).get(value.split("\\.")[1]);
+                                    if(o instanceof String){
+                                        pid = (String)o;
+                                    }
+                                    else if(o instanceof Integer){
+                                        pid = String.valueOf(o);
+                                    }
                                 }
                                 else if(pidObj instanceof List){
                                     Object o = ((List<Map<String,?>>) pidObj).get(0).get(value.split("\\.")[1]);