Drupal-Postgres installation problem

In a clean Drupal-Postgres installation I get the error:

* warning: pg_query(): Query failed: ERROR: el valor null para la columna «conf» viola la restricción not null in /var/www/drupal/includes/database.pgsql.inc on line 139.
* user warning: query: INSERT INTO dashboard_default (id, title,description,thumbnail,tags,default_enabled,widget_type,subtype) VALUES ('1','Recent Comments Block', 'Recent Comments.', '0','comments','1','block','comment-0') in /var/www/drupal/sites/all/modules/dashboard/dashboard.install on line 14.

Thanks.