Fatal error: Uncaught mysqli_sql_exception: Duplicate entry '1757569372' for key 'last_activity_idx' in /scalar-data/scalar.usc.edu/works/system/database/drivers/mysqli/mysqli_driver.php:180
Stack trace:
#0 /scalar-data/scalar.usc.edu/works/system/database/drivers/mysqli/mysqli_driver.php(180): mysqli_query(Object(mysqli), 'INSERT INTO `sc...')
#1 /scalar-data/scalar.usc.edu/works/system/database/DB_driver.php(456): CI_DB_mysqli_driver->_execute('INSERT INTO `sc...')
#2 /scalar-data/scalar.usc.edu/works/system/database/DB_driver.php(302): CI_DB_driver->simple_query('INSERT INTO `sc...')
#3 /scalar-data/scalar.usc.edu/works/system/libraries/Session.php(345): CI_DB_driver->query('INSERT INTO `sc...')
#4 /scalar-data/scalar.usc.edu/works/system/libraries/Session.php(109): CI_Session->sess_create()
#5 /scalar-data/scalar.usc.edu/works/system/application/core/Loader.php(1101): CI_Session->__construct()
#6 /scalar-data/scalar.usc.edu/works/system/application/core/Loader.php(977): CI_Loader->_ci_init_class('session', '', NULL, NULL)
#7 /scalar-data/scalar.usc.edu/works/system/application/core/Loader.php(218): CI_Loader->_ci_load_class('Session', NULL, NULL)
#8 /scalar-data/scalar.usc.edu/works/system/application/core/MY_Controller.php(48): CI_Loader->library('session')
#9 /scalar-data/scalar.usc.edu/works/system/application/controllers/book.php(48): MY_Controller->__construct()
#10 /scalar-data/scalar.usc.edu/works/system/core/CodeIgniter.php(309): Book->__construct()
#11 /scalar-data/scalar.usc.edu/works/codeigniter.php(203): require_once('/scalar-data/sc...')
#12 {main}
thrown in /scalar-data/scalar.usc.edu/works/system/database/drivers/mysqli/mysqli_driver.php on line 180