Executing "drush mongodb-migrate" causes an error when migrating the comment fields

I executed drush mongodb-migrate, and I got the following error:

Unknown column 'node_type' in 'where clause':

SELECT e.cid AS cid FROM {comment} e
WHERE (cid > :db_condition_placeholder_0) AND (node_type IN
(:db_condition_placeholder_1, :db_condition_placeholder_2, :db_condition_placeholder_3,
:db_condition_placeholder_4, :db_condition_placeholder_5, :db_condition_placeholder_6))

The comment table doesn't have a node_type field.