Deleting a row from Aria table results to 'Index is corrupt'

CREATE TABLE iccl (

    id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'Primary id',

    i_datsetid VARCHAR(100) NOT NULL COMMENT 'Data set ID',

    system_id TINYINT UNSIGNED NOT NULL COMMENT 'Reference to id in SYSTEM table',

    part_id INT NOT NULL COMMENT 'Reference to id in PART table',

    i_dateeffe INT NOT NULL COMMENT 'Date effective',

    i_timeeffe BIGINT(12) NOT NULL COMMENT 'Time effective',

    i_newvalue DECIMAL(20,2) NOT NULL COMMENT 'New value',

    i_usercod1 VARCHAR(16) COMMENT 'User defined code 1',

    i_usercod2 VARCHAR(16) COMMENT 'User defined code 2',

    i_usercod3 VARCHAR(16) COMMENT 'User defined code 3',

    i_usercod4 VARCHAR(16) COMMENT 'User defined code 4',

    i_usercod5 VARCHAR(16) COMMENT 'User defined code 5',

    business_day CHAR(8) NOT NULL COMMENT 'Business day',

    transaction_link_id VARCHAR(100) COMMENT 'Transaction link ID',

    order_type VARCHAR(10) COMMENT 'Type of the iccl order',

    entry_date INT COMMENT 'Entry date',

    entry_time BIGINT(12) COMMENT 'Entry time',

    revocation_date INT COMMENT 'Revocation date',

    revocation_time BIGINT(12) COMMENT 'Revocation time',

    modified TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT 'Last modified time stamp',

    INDEX idx_iccl_bus_day (business_day),

    UNIQUE unq_iccl (id, i_datsetid, system_id, part_id, business_day)

) ENGINE=Aria;

DELETE FROM iccl WHERE system_id = ? AND i_datsetid = ?