Hikashop Registration - Is not saving user_id

-- HikaShop version -- : Business : 2.3.4 [1410211134]
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.4+

Hello,

I just noticed this issue.
All new registrations through Hikashop user registration form do not save new user_id into hikashop_user table.

User is being created and exist in Joomla and most of the rest data are saved in the hikashop_user table (didn't check it thoroughly), but everyone gets a user_id = 0.

From my research so far, it looks like the table's structure has been changed and it's not something in the saving process. For example user_id column is not set to auto-increment and other options might be different as well.

Do you have any ideas what could cause this and any suggestions on the best safer practice to update the table structure's ?

I resolved this by installing a fresh new hikashop on clean joomla install.
Then renamed my old hikashop_user table on my site, to something else and copied the hikashop_user table structure and created a new table in my site. Finally I moved the records of the my old table to the new one.
Now registration through hikashop form works fine and creates user_id's.