horizon: Predis throwing a 'ServerException'

After installing Horizon (server is running through Forge), Predis throws a ServerException when dispatching a new job. [Predis\Response\ServerException] ERR value is not a valid float Created a ‘empty’ job to test, but also throws the same exception. Dispatching test job dispatch((new \App\Jobs\Test)->onQueue('default')); Horizon dashboard is working, configuration is the same as the one from the horizon documentation. When changing queue driver to ‘database’ everything works fine.