Hm, I think I know. I've rechecked it and uploaded new version (pending approval) with a "fix" for that. You may "fix" that by running that query:
CREATE TABLE `dp4custombadwords_settings` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`mid` int(10) UNSIGNED NOT NULL DEFAULT '0',
`dp42bypass_badwords` tinyint(3) UNSIGNED NOT NULL DEFAULT '0'
);
ALTER TABLE `dp4custombadwords_settings`
ADD PRIMARY KEY (`id`),
ADD UNIQUE KEY `mid` (`mid`);