diff --git a/src/main/java/ocl/util/CheckXMLConsistency.java b/src/main/java/ocl/util/CheckXMLConsistency.java
index bc7aa29..bd77f2b 100644
--- a/src/main/java/ocl/util/CheckXMLConsistency.java
+++ b/src/main/java/ocl/util/CheckXMLConsistency.java
@@ -93,7 +93,8 @@ public void IDUniqueness(Profile EQ, Profile TP, Profile SSH, Profile SV) throws
             );
             results.add(evaluationResult);
         }
-        writeJsonResults(results);
+        if(results.size()!=0)
+            writeJsonResults(results);
     }
 
     /**