Generating content with Comments gives error message

When I attempt to create both articles and basic pages, choosing the following settings:
50 nodes
1 year ago
12 max comments
12 max word length

I get the following error message:
An AJAX HTTP error occurred. HTTP Result Code: 500 Debugging information follows. Path: /drupal7/batch?render=overlay&id=5&op=do StatusText: Service unavailable (with message) ResponseText: PDOException: SQLSTATE[22001]: String data, right truncated: 1406 Data too long for column 'subject' at row 1: INSERT INTO {comment} (nid, pid, uid, subject, hostname, created, changed, status, thread, name, mail, homepage, language) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9, :db_insert_placeholder_10, :db_insert_placeholder_11, :db_insert_placeholder_12); Array ( [:db_insert_placeholder_0] => 6 [:db_insert_placeholder_1] => 0 [:db_insert_placeholder_2] => 0 [:db_insert_placeholder_3] => Aptent Elit Luptatum Paratus Pecus Premo Probo Proprius Uxor Valetudo Vulpes Zelus [:db_insert_placeholder_4] => 99.112.4.60 [:db_insert_placeholder_5] => 1294844738 [:db_insert_placeholder_6] => 1294844738 [:db_insert_placeholder_7] => 1 [:db_insert_placeholder_8] => 01/ [:db_insert_placeholder_9] => devel generate [:db_insert_placeholder_10] => devel_generate@example.com [:db_insert_placeholder_11] => [:db_insert_placeholder_12] => und ) in comment_save() (line 1573 of /drupal7/modules/comment/comment.module).