I confirm the error issue. Our website’s error_log grew 150Kb in the last several days…
The log says:
[20-Sep-2014 14:44:17 Europe/Brussels] WordPress databasefout Duplicate entry ‘2014-09-20-IP.AD.DRE.SS’ for key ‘date_ip’ bij query INSERT INTO wp_statistics_visitor
(last_counter
,referred
,agent
,platform
,version
,ip
,location
,UAString
) VALUES (‘2014-09-20′,’https://mydomain.com’,’Chrome’,’Macintosh’,’28.0.1500.71′,’72.14.199.99′,’US’,”) gemaakt door shutdown_action_hook, do_action(‘shutdown’), call_user_func_array, wp_statistics_shutdown_action, Hits->Visitors