Mysql database column constrain error
===

I am having a problem Id really love if I could have some help, here it goes, I have a database, which is working perfectly however when I backed it up and moved it to another PC it started to act up, it is identical to the original, now I have a table called Authorize, and a column authorized with a default not being null, however when ever i try to update the authorized column the following message comes up(Im using a php application to interact with the database) however on the original system it still works fine, I can't seem to find the problem.

    Error: Column 'authorized' cannot be null
    sql: update `authorized` set `authorized` = :authorized where `authorized_id` = :identity_id;
    
    arr_sql_param: Array
    (
    [:identity_id] => 22
    [:authorized] => 
    )
    
    Sent From: update_grid()