I am getting this message trying to update 1.2.6 to 1.2.7 through the extensions menu.

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There has been a critical error processing your request

SQL Error: Duplicate key name 'ab_settings_idx'
Error No: 1061
SQL: ALTER TABLE `ab_settings` ADD INDEX `ab_settings_idx` USING BTREE (`group` ASC, `key` ASC); in /home/marion6/public_html/core/database/amysqli.php on line 106

Report this problem to AbanteCart team (do not change email subject)
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I checked and the 'ab_settings_idx' exists. Should I delete the index and retry?

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Evert