I get an error with dev version

As beta version don't have all the patch I need the dev version, but it gives me an error when I tray to save the configuration

An AJAX HTTP error occurred.
HTTP Result Code: 500
Debugging information follows.
Path: /system/ajax
StatusText: Service unavailable (with message)
ResponseText: PDOException: SQLSTATE[HY000]: General error: 1364 Field 'machine_name' doesn't have a default value: INSERT INTO {path_metatags} (data) VALUES (:db_insert_placeholder_0); Array
(
[:db_insert_placeholder_0] => a:5:{s:8:"metatags";N;s:15:"metatags_values";N;s:12:"translatable";N;s:9:"arguments";N;s:6:"access";a:0:{}}
)
in drupal_write_record() (line 7106 of /home/oskar/webapps/drupal/project/includes/common.inc).