duplicated entry error

Hi. One of our websites is getting a huge load of errors that seem to be related to this plugin. Can you give it a look?

[29-Apr-2021 21:20:20 UTC] WordPress database error Duplicate entry ‘1’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘1’, ‘EUR’, ‘1’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:20 UTC] WordPress database error Duplicate entry ‘2’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘2’, ‘GBP’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:20 UTC] WordPress database error Duplicate entry ‘3’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘3’, ‘USD’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:20 UTC] WordPress database error Duplicate entry ‘4’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘4’, ‘DKK’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:20 UTC] WordPress database error Duplicate entry ‘5’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘5’, ‘NOK’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:20 UTC] WordPress database error Duplicate entry ‘6’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘6’, ‘SEK’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:20 UTC] WordPress database error Duplicate entry ‘7’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘7’, ‘CHF’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:20 UTC] WordPress database error Duplicate entry ‘8’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘8’, ‘HUF’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:20 UTC] WordPress database error Duplicate entry ‘9’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘9’, ‘PLN’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:50 UTC] WordPress database error Duplicate entry ‘1’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘1’, ‘EUR’, ‘1’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:50 UTC] WordPress database error Duplicate entry ‘2’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘2’, ‘GBP’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:50 UTC] WordPress database error Duplicate entry ‘3’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘3’, ‘USD’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:50 UTC] WordPress database error Duplicate entry ‘4’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘4’, ‘DKK’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:50 UTC] WordPress database error Duplicate entry ‘5’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘5’, ‘NOK’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:50 UTC] WordPress database error Duplicate entry ‘6’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘6’, ‘SEK’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:50 UTC] WordPress database error Duplicate entry ‘7’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘7’, ‘CHF’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:50 UTC] WordPress database error Duplicate entry ‘8’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘8’, ‘HUF’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)
[29-Apr-2021 21:20:50 UTC] WordPress database error Duplicate entry ‘9’ for key ‘PRIMARY’ for query INSERT INTO tjnRNYwzoutshifter_settings (id, currency, selected) VALUES (‘9’, ‘PLN’, ‘0’) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), include_once(‘/plugins/outshifter-export/index.php’)