Cron Daemon Emails

I have an FreePBX installation with HA modules licensed. I am getting the following email every few minutes:

PHP Fatal error: 
Uncaught exception 'PDOException' with message 'SQLSTATE[23000]:
Integrity constraint violation: 1062 Duplicate entry
'Dashboard-1431702000-HALFHR' for key 'index3'' in
/drbd/httpd/www/html/admin/libraries/BMO/DB_Helper.class.php:232

Stack trace:

#0
/drbd/httpd/www/html/admin/libraries/BMO/DB_Helper.class.php(232):
PDOStatement->execute(Array)

#1
/drbd/httpd/www/html/admin/modules/dashboard/classes/PruneHistory.class.php(130):
DB_Helper->setConfig(1431702000, Array, 'HALFHR')

#2 /drbd/httpd/www/html/admin/modules/dashboard/classes/PruneHistory.class.php(113):
PruneHistory->commitAvg(Array, 1431702000, 'MINUTES')

#3
/drbd/httpd/www/html/admin/modules/dashboard/classes/PruneHistory.class.php(59):
PruneHistory->avgPeriod('MINUTES')

#4
/drbd/httpd/www/html/admin/modules/dashboard/Dashboard.class.php(194):
PruneHistory->doPrune()

#5
/drbd/httpd/www/html/admin/modules/dashboard/Dashboard.class.php(183):
Dashboard->pruneSysInfo()

#6
/drbd/httpd/www/html/admin/modules/dashboard/Dashboard.class.php(202):
Dashboard->ge in
/drbd/httpd/www/html/admin/libraries/BMO/DB_Helper.class.php on line 232

Advice would be appreciated.