Watchdog events not recognized cause dblog to receive invalid index errors

Saved watchdog events are not recognized by the dblog module which cause the following php errors when viewing reports of the recent logged events (unfiltered type and severity):
# notice: Undefined index: 6 in C:\WWWRoot\drupal\modules\dblog\dblog.admin.inc on line 68.
# notice: Undefined index: 6 in C:\WWWRoot\drupal\modules\dblog\dblog.admin.inc on line 76.

The index is for the severity of the entry. So, consequently it appears that this module is using a severity that is unknown.