null when working on tickets

[Michael LiVolsi]

I have an interesting issue.

There's an issue that whenever  a particular person opens up a ticket, or replies to a ticket, it gets set to null in the "ticket_change" table under "author".

We authenticate against LDAP, but I compared them to active users, and their account seems correct.

The only thing that stood out was in the session_attribute table. This person did not have an email record. I manually added it. I'm not 100% sure this will fix the issue as there are a number of active users without this attribute but doesn't seem to affect them. 

Is there anything else I should be looking at ?