Invalid timed bans can mess up the saved config

[Mustek]

Source is possibly caused by invalid timers.

Example:

{
  "timers": [
    {
      "time": "2016-05-24T12:06:35.378Z",
      "action": "-b",
      "target": "*!*@REMOVED",
      "channel": "#minecraft"
    }
  ]
}{
      "time": "2016-05-25T21:24:39.358Z",
      "action": "unban",
      "target": "*!*@REMOVED2",
      "channel": "#minecraft"
    }
  ]
}