diff --git a/src/main/java/eu/dnetlib/usagestats/sushilite/domain/ItemPerformance.java b/src/main/java/eu/dnetlib/usagestats/sushilite/domain/ItemPerformance.java
index a3e7c32..5cb7e9f 100755
--- a/src/main/java/eu/dnetlib/usagestats/sushilite/domain/ItemPerformance.java
+++ b/src/main/java/eu/dnetlib/usagestats/sushilite/domain/ItemPerformance.java
@@ -9,16 +9,24 @@ import java.util.List;
  * Created by tsampikos on 31/10/2016.
  */
 public class ItemPerformance {
+
     private Period period;
     private List<Instance> instances = new ArrayList<>();
 
     public ItemPerformance() {
     }
 
-    public ItemPerformance(String start, String end, String ft_count, String abstr) {
+    public ItemPerformance(String start, String end, String ft_count,
+            String abstr) {
         period = new Period(start, end);
-        instances.add(new Instance("Total_Items_Requests", ft_count));
-        instances.add(new Instance("Total_Items_Investigations", abstr));
+        if (ft_count != null && abstr != null) {
+            instances.add(new Instance("Total_Items_Requests", ft_count));
+            instances.add(new Instance("Total_Items_Investigations", abstr));
+        }
+        else if(ft_count != null && abstr == null )
+            instances.add(new Instance("Total_Items_Requests", ft_count));
+        else if(ft_count == null && abstr != null )
+            instances.add(new Instance("Total_Items_Investigations",abstr));
     }
 
     @JsonProperty("Period")
@@ -30,7 +38,6 @@ public class ItemPerformance {
 //    public String getCategory() {
 //        return "Requests";
 //    }
-
     @JsonProperty("Instance")
     public List<Instance> getInstance() {
         return instances;