Bug with 'To date:' field

Hi !

I have a recurent bug with the 'To Date' field, in both 'optionnal' or 'Required' choice.

this is the message error :

Warning: Got a packet bigger than 'max_allowed_packet' bytes query: INSERT INTO watchdog (uid, type, message, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', 'Got a packet bigger than 'max_allowed_packet' bytes\nquery: UPDATE cache SET data = 'a:4:{s:6:\\"tables\\";a:130:{s:5:\\"audio\\";a:4:{s:4:\\"name\\";s:5:\\"audio\\";s:4:\\"join\\";a:2:{s:4:\\"left\\";a:2:{s:5:\\"table\\";s:4:\\"node\\";s:5:\\"field\\";s:3:\\"vid\\";}s:5:\\"right\\";a:1:{s:5:\\"field\\";s:3:\\"vid\\";}}s:6:\\"fields\\";a:5:{s:10:\\"play_count\\";a:3:{s:4:\\&amp in /var/www/cdmc.asso.fr/html/internet_dev/includes/database.mysql.inc on line 172