DirectAdmin - /usr/local/directadmin/scripts/letsencrypt.sh: line 214: secp384r1: integer expression expected

Ошибка:

/usr/local/directadmin/scripts/letsencrypt.sh: line 214: [: secp384r1: integer expression expected

при установке SSL Let's Encrypt через Directadmin.
Решение - это обновить плагин:

# cd /usr/local/directadmin/custombuild
# ./build update
# ./build letsencrypt