redis 5 does not support a logger option
MODIFY
lib/beetle/redis_ext.rb
lib/beetle/redis_ext.rb
@@ -3,6 +3,7 @@ class Redis #:nodoc:
def self.from_server_string(server_string, options = {})
host, port = server_string.split(':')
options = {:host => host, :port => port}.update(options)
+ options.delete(:logger) if Redis::VERSION >= "5.0"
new(options)
end

redis 5 does not support a logger option