LDAP Error - Invalid Syntax #9

Hi All,

I have upgraded my server from v4.4.1 to v4.4.2 today. Following this upgrade, if I try to add a new user I get the following error: Notification
The LDAP object could not be saved: LDAP Error Invalid syntax: objectClass: value #9 invalid per syntax

Has anybody seen this before or have any idea what might this error might mean?