NodeRED node ‘Battery Monitor’ outputs ’null’ as the result for the energy values. 🤷‍♂️

Produkt Cerbo GX MK2
Firmware-Version v3.60~39

NodeRED in use:

  • Runtime Maintenance Release 3.1.13
  • Palette: @victronenergy/node-red-contrib-victron 1.6.17

The node ‘Battery Monitor’ with the following Energy selections lead to "null" output:

Currently stored selection:
* VE.Can Pytes Battery
* Charged Energy (kWh)

Debug Message: VE.Can Pytes Battery - Charged Energy (kWh) : msg.payload : null

Currently stored selection:
* VE.Can Pytes Battery
* Discharged Energy (kWh)

Debug Message: VE.Can Pytes Battery - Discharged Energy (kWh) : msg.payload : null

While if you select e.g. Battery power (W) it leads to a valid result

Currently stored selection:
* VE.Can Pytes Battery
* Battery power (W)

Debug Message:

VE.Can Pytes Battery - Battery power (W) : msg.payload : number
-1175

Does anyone have any idea what could be causing this result?
Application error? Battery/BMS? Missing system configuration? An error in the battery monitor? Or something completely different?

Many thanks in advance.