attempting live stream on a camera crashed server
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# Bug Report

### Describe the Bug
<!-- ✍️edit: --> Just clicked on a camera in Home app on iOS and it caused Hoobs to crash due to an error: 

`This callback function has already been called by someone else; it can only be called one time.
`
### To Reproduce
Steps to reproduce the behavior:
 - Start Homebridge
 - Just clicked on a camera to view live
 - Homebridge/Hoobs crashed

### Expected behavior
<!-- ✍️edit: --> Expected behavior was to view the live camera stream

### Screenshots/Logs
<!-- ✍️edit: --> If applicable, add screenshots and log output to help explain your problem.

```
6/5/2020, 5:54:36 PM [Ring] Streaming active for Front Garage
6/5/2020, 5:54:37 PM Error: This callback function has already been called by someone else; it can only be called one time.
    at /usr/local/lib/node_modules/@hoobs/hoobs/node_modules/hap-nodejs/dist/lib/util/once.js:11:19
    at Mute.<anonymous> (/home/hoobs/.hoobs/node_modules/homebridge-ring/lib/homebridge/base-data-accessory.js:19:17)
    at Mute.emit (events.js:215:7)
    at Mute.EventEmitter.emit (/usr/local/lib/node_modules/@hoobs/hoobs/node_modules/hap-nodejs/dist/lib/EventEmitter.js:59:38)
    at Mute.Characteristic._this.getValue (/usr/local/lib/node_modules/@hoobs/hoobs/node_modules/hap-nodejs/dist/lib/Characteristic.js:190:23)
    at /usr/local/lib/node_modules/@hoobs/hoobs/node_modules/hap-nodejs/dist/lib/Accessory.js:753:32
    at Array.forEach (<anonymous>)
    at Bridge.Accessory._this._handleGetCharacteristics (/usr/local/lib/node_modules/@hoobs/hoobs/node_modules/hap-nodejs/dist/lib/Accessory.js:694:18)
    at HAPServer.emit (events.js:210:5)
    at HAPServer.EventEmitter.emit (/usr/local/lib/node_modules/@hoobs/hoobs/node_modules/hap-nodejs/dist/lib/EventEmitter.js:59:38)
6/5/2020, 5:54:37 PM Got SIGTERM, shutting down Bridge...
```

### Additional context
<!-- ✍️edit: --> Wasn't able to reproduce, working fine on subsequent attempts 

### Homebridge Ring Config
Post homebridge-ring platform config  _without sensitive information_
```
        {
            "platform": "Ring",
            "plugin_map": {
                "plugin_name": "homebridge-ring"
            },
            "refreshToken": "xxx",
            "hideCameraMotionSensor": true,
            "hideCameraSirenSwitch": true,
            "hideInHomeDoorbellSwitch": true,
            "hideAlarmSirenSwitch": true,
            "hideUnsupportedServices": true,
            "showPanicButtons": false,
            "locationIds": []
        }

```

### Environment
<!-- ✍️edit: -->
 - OS: Raspbian 4.19.75-v7l+
 - Node.js: 12.13.1
 - NPM: 6.13.4
 - homebridge-ring: 8.2.0
 - homebridge: Hoobs 3.2.6
