i have tested it before a few minutes here again, but can not reproduce your error.
And i have also used your group names (Usuários Automação) for group and level name (see first pic).
So it seems that here exists a other problem. When i see your posted MySQL Error, it exists not a correct value for the query here SELECT user_id FROM t8pjl_user_usergroup_map WHERE group_id IN () <--
By the way, when you will in future remove an error like this, it is enough to deactivate the plugin in phpmyadmin in the #__extension table (see second pic).
I work with Joomla since 2005 and I never see a simple plugin crashes whole site. Never.
I work also since 2005 with it.
In your case have your site crashed, because this plugin is a "system plugin" and worked all the time in background.
Please excuse me, when you have special trouble with this plugin, but i check all my extensions very extensive before i publish it.
Please mind, that also until today nobody else has posted a problem like yours.
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