MySQL query error [1062]: Duplicate entry 'hasan69' for key 'xf_user.username'

Server error log:

Code:

XF\Db\DuplicateKeyException: MySQL query error [1062]: Duplicate entry 'hasan69' for key 'xf_user.username' src/XF/Db/AbstractStatement.php:228

Generated by: Unknown account Mar 3, 2021 at 2:40 PM

Stack trace

INSERT  INTO `xf_user` (`visible`, `activity_visible`, `user_group_id`, `timezone`, `language_id`, `last_summary_email_date`, `username`, `email`, `user_state`, `privacy_policy_accepted`, `terms_accepted`, `dbtech_shop_purchase`, `display_style_group_id`...

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