Fatal error: Out of memory (allocated 2097152) (tried to allocate 20480 bytes) in /var/www/magento2/vendor/magento/framework/Data/Structure.php on line 640

Fatal error: Out of memory (allocated 2097152) (tried to allocate 4096 bytes) in /var/www/magento2/vendor/magento/framework/Session/SessionManager.php on line 150