Blocks Keyed on Title - produces sql duplicate error using blank title

I thought this was fixed ages ago, but it seems to have come back.
It makes no sense to key the blocks table on the title that will displayed - I never understood this one.
Isn't it meant to use the description for the key now?
Any way below is the error it generates:
Any work around would be very helpful. Any ideas?

user error: Duplicate entry '' for key 2
query: INSERT INTO boxes (title, body, info, format) VALUES ('', '', 'My Block Description', 3) in /home/www/drupal/includes/database.mysql.inc on line 66.

warning: Cannot modify header information - headers already sent by (output started at /home/www/drupal/includes/common.inc:384