Hey yo! still me!

Somebody finally managed to solve this common error?

2015-03-14 22:05:59,670 15536 INFO 03test werkzeug: 192.168.1.1 - - [14/Mar/2015 22:05:59] "POST /longpolling/poll HTTP/1.1" 200 -
2015-03-14 22:05:59,680 15536 INFO 03test werkzeug: 192.168.1.1 - - [14/Mar/2015 22:05:59] "POST /longpolling/poll HTTP/1.1" 200 -
2015-03-14 22:05:59,737 15536 ERROR 03test openerp.sql_db: bad query: UPDATE "im_chat_presence" SET "status"='online',"last_poll"='2015-03-14 22:05:59',"write_uid"=8,"write_date"=(now() at time zone 'UTC') WHERE id IN (3)
Traceback (most recent call last):
  File "/home/odoo-test/odoo-test/openerp/sql_db.py", line 234, in execute
    res = self._obj.execute(query, params)
TransactionRollbackError: could not serialize access due to concurrent update

2015-03-14 22:05:59,737 15536 INFO 03test openerp.service.model: SERIALIZATION_FAILURE, retry 1/5 in 0.7362 sec...
2015-03-14 22:06:37,921 15536 INFO 03test werkzeug: 66.249.67.142 - - [14/Mar/2015 22:06:37] "GET /fr_CA/forum/aide-1/partner/3 HTTP/1.1" 302 -