Urban Giraffe Support

In the Audit Trail Options, Other Options, I am trying to ignore the user id "admin" but when I type it in and save the options it disappears. If I put a comma behind it only the comma appears in the field after saving. I have checked the mysql db and the field is not saving "admin" but it will save the comma. I tried to force the plugin to work by manually entering the "admin" in the database but it did not work. When I checked the options again it was there but as I saved the options it was removed from the option box in the plugin. Can you help me please?? or point me in the right direction? Thanks so much... great plugin by the way!