0023023: Error to insert an USER calling to web service

<?xml version="1.0" encoding="UTF-8"?>
<ob:Openbravo xmlns:ob="http://www.openbravo.com">
<ADUser>
<active>true</active>
<firstName>xxxName User</firstName>
<lastName>xxxLastName User</lastName>
<email>xxxmail@user.com</email>
<phone>xxx123456</phone>
<position>xxxConsultan</position>
<businessPartner id="2C4C71BC828B47A0AF2A79855FD3BA7A" />
<name>xxxName User Last Name</name>
</ADUser>
</ob:Openbravo>

diff --git a/src/org/openbravo/dal/xml/EntityResolver.java b/src/org/openbravo/dal/xml/EntityResolver.java
--- a/src/org/openbravo/dal/xml/EntityResolver.java
+++ b/src/org/openbravo/dal/xml/EntityResolver.java
@@ -145,7 +145,7 @@
         }
         result = searchInstance(entity, id);
       }
-    } else {
+    } else  if (id != null)  {
       result = OBDal.getInstance().get(entityName, id);
     }