Clients with empty username are not receiving request new password email

Question

I am looking after a old site from a client and a lot of users dont have username.

I had setup in woocommerce "When creating an account, automatically generate a username from the customer's email address", but for some reason it is not creating username for the new user, so I unticked that and left the field mandatory.

Now, If an user with blank username request a new password, wordpress doesnt send an email. Only if I go manually to the phpmyadmin and included it. However there are more than 500 users without username. Is there a way to automatically get the user email for example and include in the username field?

Or make wordpress send email even with no username?

Thank you,

Answer 1

WordPress functions doesn't allow to modify user login then you need to change directly the database.

make a backup of you database and try this to fill login with something like user4589

UPDATE `wp_users` SET `user_login` = CONCAT("user", ID) WHERE `user_login` = ""