Error when saving an embedded children view with a long name

The following error occurs when embedding a children view with a long machine name:

PDOException: SQLSTATE[22001]: String data, right truncated: 1406 Data too long for column 'nh_children_view' at row 1: INSERT INTO {nodehierarchy_views} (nid, nh_children_view, nh_children_view_display) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2); Array ( [:db_insert_placeholder_0] => 619 [:db_insert_placeholder_1] => nodehierarchy_children_list_reverse [:db_insert_placeholder_2] => default ) in nodehierarchy_views_update() (line 202 of /xxxx/sites/default/modules/nodehierarchy/nodehierarchy_views/nodehierarchy_views.module).