Error: Out of memory (allocated 15314944) (tried to allocate 20480 bytes) (500 Whoops, looks like something went wrong.)

Fatal error: Out of memory (allocated 15314944) (tried to allocate 20480 bytes) in /var/www/lcn.news/libraries/vendor/joomla/database/src/Mysqli/MysqliStatement.php on line 550
Error: Out of memory (allocated 15314944) (tried to allocate 20480 bytes) (500 Whoops, looks like something went wrong.)