Hi Hector
For the past few days, I've been seeing this error in my site's log file:
[18-Dec-2014 23:59:04] WordPress database error Duplicate entry '23248' for key 'PRIMARY' for query INSERT INTO wp_popularpostssummary
(postid, pageviews, view_date, last_viewed) VALUES (16774, 1, '2014-12-19', '2014-12-19 01:59:04')
ON DUPLICATE KEY UPDATE pageviews = pageviews + 1, last_viewed = '2014-12-19 01:59:04'; made by do_action('wp_ajax_nopriv_update_views_ajax'), call_user_func_array, WordPressPopularPosts->update_views_ajax, WordPressPopularPosts->__update_views