Fatal error: Out of memory (allocated 6291456) (tried to allocate 20480 bytes) in /var/www/html/includes/HeaderCallback.php on line 32

Fatal error: Out of memory (allocated 6291456) (tried to allocate 20480 bytes) in /var/www/html/vendor/wikimedia/php-session-serializer/src/Wikimedia/PhpSessionSerializer.php on line 370