Sounds 1.2.7a should now be able to support version 1.8 - 1.16.4, hasn't been fully tested so this will be an alpha release. Please let me know if you've tested it for version below 1.16.3.
I've added support for version 1.16.4 and a cleaner error message if this plugin is running on an unsupported server version. This will also disable itself to avoid further error reporting and memory usage.