json-serialiser

diff --git a/src/main/java/br/ufrgs/inf/prosoft/jsonserialiser/JSONSerialiser.java b/src/main/java/br/ufrgs/inf/prosoft/jsonserialiser/JSONSerialiser.java
index 6de7fa8..3442f68 100644
--- a/src/main/java/br/ufrgs/inf/prosoft/jsonserialiser/JSONSerialiser.java
+++ b/src/main/java/br/ufrgs/inf/prosoft/jsonserialiser/JSONSerialiser.java
@@ -262,7 +262,11 @@ public class JSONSerialiser {
                 }
             }
         } catch (Exception ex) {
-            System.err.println("[JSONSerialiser] collection serialise exception: " + ex);
+            String toString = ex.toString();
+            if (!toString.startsWith("org.hibernate")) {
+                System.err.println("[JSONSerialiser] collection serialise exception: " + toString);
+                return new StringBuilder().append("[\"JSON_COLLECTION_HIBERNATE_EXCEPTION\"]");
+            }
             return new StringBuilder().append("[\"JSON_COLLECTION_EXCEPTION\"]");
         }
         return stringBuilder.append("]");