SyntaxError: Unexpected token '.' if (msg?.path?.indexOf(this.pathRoot) === 0)

Tried to install on a Debian 11 miniPC and on Pi4
Both give the same error:

```
Sep 16 16:53:11 Wohnzimmer systemd[1]: Cybele.service: Failed with result 'exit-code'.
Sep 16 16:53:11 Wohnzimmer systemd[1]: Cybele.service: Main process exited, code=exited, status=1/FAILURE
Sep 16 16:53:11 Wohnzimmer node[13973]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
Sep 16 16:53:11 Wohnzimmer node[13973]: at Module._compile (internal/modules/cjs/loader.js:999:30)
Sep 16 16:53:11 Wohnzimmer node[13973]: at Object. (/home/pi/Cybele/lib/DongleFactory.js:4:16)
Sep 16 16:53:11 Wohnzimmer node[13973]: at require (internal/modules/cjs/helpers.js:74:18)
Sep 16 16:53:11 Wohnzimmer node[13973]: at Module.require (internal/modules/cjs/loader.js:887:19)
Sep 16 16:53:11 Wohnzimmer node[13973]: at Function.Module._load (internal/modules/cjs/loader.js:708:14)
Sep 16 16:53:11 Wohnzimmer node[13973]: at Module.load (internal/modules/cjs/loader.js:863:32)
Sep 16 16:53:11 Wohnzimmer node[13973]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
Sep 16 16:53:11 Wohnzimmer node[13973]: at Module._compile (internal/modules/cjs/loader.js:963:27)
Sep 16 16:53:11 Wohnzimmer node[13973]: at wrapSafe (internal/modules/cjs/loader.js:915:16)
Sep 16 16:53:11 Wohnzimmer node[13973]: SyntaxError: Unexpected token '.'
Sep 16 16:53:11 Wohnzimmer node[13973]: ^
Sep 16 16:53:11 Wohnzimmer node[13973]: if (msg?.path?.indexOf(this.pathRoot) === 0) {
Sep 16 16:53:11 Wohnzimmer node[13973]: /home/pi/Cybele/lib/Dongle.js:160
```