Cloning a quiz with pages broken

Message PDOException: SQLSTATE[HY000]: General error: 1364 Field 'child_nid' doesn't have a default value: INSERT INTO {quiz_node_relationship} (qnr_pid, parent_nid, parent_vid, question_status, weight, max_score, auto_update_max_score) 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); Array ( [:db_insert_placeholder_0] => 299 [:db_insert_placeholder_1] => 365 [:db_insert_placeholder_2] => 746 [:db_insert_placeholder_3] => 1 [:db_insert_placeholder_4] => 8 [:db_insert_placeholder_5] => 1 [:db_insert_placeholder_6] => 0 ) in drupal_write_record() (line 7333 of includes/common.inc).