Very old Horde versions used the user name for the default share's name.

I want to upgrade Horde to latest version, during upgrade vom sql 
database schema for turba i see (via horde debug log) many many sql 
calls like this

[horde] SQL  (0.0006s)    SELECT * FROM turba_sharesng WHERE 
share_name =           'EMAIL@ADDRESS' [pid 26086 on line 208 of 
"/var/www/html/live/horde/pear/lib/php/Horde/Db/Adapter/Pdo/Base.php"]

but the problem is, i got errors because of duplicate entry. so i had 
to dig this down, and i found that this upgradequery seems to be false ?

table "turba_sharesng" looks like this

select share_id,share_name,share_owner from turba_sharesng;

+----------+-------------------------+------------------+
| share_id | share_name              | share_owner      |
+----------+-------------------------+------------------+
|     1 | u9OhbsL8999OCXSF3OHCC2A | email@adress |
|     2 | 8fYeNUlCcOxOCXmlswVXnfA | email2@adresse |
+----------+-------------------------+------------------+

so the right query seems to be "SELECT * FROM turba_sharesng WHERE 
share_owner...", because ob share_name only has a hash stored and not 
emailaddresses ?