On ldap configuration file I left default ldap_user_attr_country=co.
Looking at AD Database it contains country as unicode string always in English. So in my case "Italy".
When user login, data are collected from AD, but when I go to "My Profile" a fatal error appears.
If I manually change the country, "My profile" works well.
I changed "ldap_user_attr_country" to "c", which in my case contains "IT" in AD database.
Now it's working fine.