Undefined arrray key in bulk action

PHP Warning: Undefined array key "action" in */wp-content/plugins/email-log/include/Core/Request/NonceChecker.php on line 66

It happens when using the bottom bulk action to delete log entries.

    if ( isset( $_REQUEST['action'] ) || isset( $_REQUEST['action2'] ) ) {
        $action = sanitize_text_field( $_REQUEST['action'] );

Second kine could be rewritten into:

        $action = sanitize_text_field( $_REQUEST['action'] ?? $_REQUEST['action2'] );