Undefined index 'data' when search_api_update_7116() gets executed

When upgrading to the latest release of search api, a PHP notice 'Undefined index: data' gets thrown. I tracked the source of the problem down to search_api_update_7116():

    $insert = db_insert('search_api_task')
      ->fields(array('server_id', 'type', 'index_id', 'data'));
    foreach ($tasks as $task) {
      $insert->values($task);
    }

'data' should be left away from the fields array, because there is no such key in any $task.