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Visiting the settings screen immediately after activation throws a PHP warning:
Warning: implode(): Invalid arguments passed in /var/www/baapwp.me/htdocs/wp-content/plugins/invitations-for-slack/invitations-for-slack/admin/settings.php on line 114
This is because the default value for the channels’ list is a string and strings don’t implode. I fixed this and sent a pull request with the fix: https://github.com/rheinardkorf/invitations-for-slack/pull/4