更新ci版本后，会出现这样的数据库错误
A Database Error Occurred
Error Number: 2014
Commands out of sync; you can't run this command now
SELECT RELEASE_LOCK('2a462af5e3c839dfbaa3265c70def1ca') AS ci_session_lock
Filename: D:/wamp/www/project/system/database/DB_driver.php
Line Number: 693
我该如何解决？