Plugin crashes my site

Message from the Plugin-Author:

I’m sorry to say that V1.5.0 of the plugin will in some cases crash your website. There is a hotfix available. If you install the Plugin for the first time this won’t happen for your site.

For existing users: Login with ftp, backup your plugin-settings.json, delete the plugin folder in ../wp-content/plugins and finally delete the file .maintenance in your html-Folder (where wp-config.php is.). The backup-restore process will not work.

If you still want to use the plugin: Will be solved with V2.0.0. But for the moment I’m still testing.