[BUG] INFO - stopping hub discovery, hubs found : undefined
Hello,

I get that errors in my Homebridge log from time to time and then I can't control my Harmonies via HomeKit:

```
[5/17/2022, 4:59:16 PM] [Wohnzimmer Fernseher] INFO - stopping hub discovery, hubs found : undefined
[5/17/2022, 4:59:16 PM] [Wohnzimmer Fernseher] (Wohnzimmer Fernseher)INFO - received discovered hubs  undefined
[5/17/2022, 4:59:16 PM] [Wohnzimmer Fernseher] (Wohnzimmer Fernseher)ERROR - no hub found 
[5/17/2022, 4:59:16 PM] [Wohnzimmer Fernseher] (Schlafzimmer Fernseher)INFO - received discovered hubs  undefined
[5/17/2022, 4:59:16 PM] [Wohnzimmer Fernseher] (Schlafzimmer Fernseher)ERROR - no hub found
```

My config is:
```
{
    "platform": "HarmonyHubWebSocket",
    "name": "Wohnzimmer Fernseher",
    "hubName": "Harmony Wohnzimmer",
    "mainActivity": "Apple TV",
    "switchAccessories": true,
    "otherPlatforms": [
        {
            "name": "Schlafzimmer Fernseher",
            "hubName": "Harmony Schlafzimmer",
            "mainActivity": "Apple TV",
            "switchAccessories": true
        }
    ]
}
```

What is the problem here please?