fluentdのin_sqsプラグインを動かすとここでコケる

output_emit.rb

    def emit(tag, es, chain)
      @emit_count += 1
      es.each {|time,record|
        tc = time / @time_slice_cache_interval   // ここでコケる
        if @before_tc == tc
          key = @before_key
        else
          @before_tc = tc
          key = @time_slicer.call(time)
          @before_key = key
        end
        data = format(tag, time, record)
        if @buffer.emit(key, data, chain)
          submit_flush
        end
      }
    end