Fatal error: Out of memory (allocated 2097152) (tried to allocate 16384 bytes) in C:\xampp\htdocs\sites\eshop\system\library\db\mysqli.php on line 18

Fatal error: Uncaught Exception: Error: Commands out of sync; you can't run this command now<br />Error No: 2014<br />REPLACE INTO `oc_session` SET session_id = '91e4545b7389b1b489c60f3d0e', `data` = '{\"language\":\"en-gb\",\"currency\":\"BDT\"}', expire = '2018-12-15 08:17:40' in C:\xampp\htdocs\sites\eshop\system\library\db\mysqli.php:40 Stack trace: #0 C:\xampp\htdocs\sites\eshop\system\library\db.php(45): DB\MySQLi->query('REPLACE INTO `o...') #1 C:\xampp\htdocs\sites\eshop\system\library\session\db.php(32): DB->query('REPLACE INTO `o...') #2 C:\xampp\htdocs\sites\eshop\system\library\session.php(81): Session\DB->write('91e4545b7389b1b...', Array) #3 [internal function]: Session->close() #4 {main} thrown in C:\xampp\htdocs\sites\eshop\system\library\db\mysqli.php on line 40