Hosting SSL. Instalation error.

After hosting_ssl module enabling -> error:

"PRIMARY KEY must be NOT NULL; if you need NULL in a key, use UNIQUE instead: CREATE TABLE {hosting_ssl_cert} ( `cid` INT unsigned auto_increment DEFAULT NULL, `ssl_key` MEDIUMTEXT NOT NULL, `client` INT unsigned NOT NULL DEFAULT 0, `status` INT unsigned NOT NULL DEFAULT 0, PRIMARY KEY (`cid`), INDEX `ssl_key`"