Plesk control panel error: MySQL query failed: Unknown column 'ip_dual_stack' in 'field list'

If you are getting an error like this in your Plesk login page:

ERROR: PleskMainDBException
MySQL query failed: Unknown column 'ip_dual_stack' in 'field list'

0: common_func.php3:220
        db_query(string 'SELECT login, type, ip_address, ip_dual_stack FROM sessions WHERE sess_id=""')
1: class.Session.php:420
        Session->init(string 'xx.xx.xx.xx')
2: auth.php3:194

Follow the below steps to fix the issue:

1. Login to psa database:

#mysql -uadmin -p'password' psa

2. Run the below query:

 mysql> ALTER TABLE sessions ADD ip_dual_stack VARCHAR(39) NULL;

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