What does that mean?

[LucaGerlich]

Fatal TypeError: Cannot set property 'getVolume' of null
at enrichBasicStatus (D:\Coding\YamahaContoller\src\simpleCommands.js:359:27)
at D:\Coding\YamahaContoller\src\simpleCommands.js:350:16
at tryCatcher (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\util.js:16:23)
at Promise._settlePromiseFromHandler (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:547:31)
at Promise._settlePromise (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:604:18)
at Promise._settlePromise0 (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:649:10)
at Promise._settlePromises (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:729:18)
at Promise._fulfill (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:673:18)
at Promise._resolveCallback (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:489:14)
at Promise._settlePromiseFromHandler (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:559:17)
at Promise._settlePromise (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:604:18)
at Promise._fulfillPromises (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:704:14)
at Promise._settlePromises (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:730:18)
at Promise._fulfill (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:673:18)
at Promise._resolveCallback (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:466:57)
at Promise._settlePromiseFromHandler (D:\Coding\YamahaContoller\node_modules\bluebird\js\release\promise.js:559:17)

[PSeitz]

When retrieving the volume, a call is made to the receiver to get it as part of the Basic_Status information

<YAMAHA_AV cmd="GET"><' + getZone(zone) + '><Basic_Status>GetParam</Basic_Status></' + getZone(zone) + '></YAMAHA_AV>

It seems your device doesn't return any information here, what device do you use?

[LucaGerlich]

I have the Yamaha RX-V475