Get error "Deadlock found when trying to get lock; try restarting transaction"

[samuelhigh]

I just installed the zabbix.
Zabbix server and mysql in server A and Web interface in server B.
Mysql's db engine is innodb.
When login the web interface,I get following err:

Error in query [UPDATE sessions SET lastaccess=1362537373 WHERE userid=1 AND sessionid='ec6b6326f2f8abad98a7bd98f651c54c'] [Deadlock found when trying to get lock; try restarting transaction]

I installed zabbix following the Guide.
Someone can give me adivce?Thnaks!