Dashticz BUG? graph of fan speed device (RPM) does not work

[willemd]

I have a device which shows the fan speed of a heatpump. Type FAN, units RPM.

For some reason, a standard graph of that device remains empty in Dashticz.
In Domoticz itself a normal graph is shown.

here is the graph definition in Dashticz

Code: Select all

blocks['graph_heatpump_sensor'] = {
    title: 'Heatpump sensor',
    width: 12,
    devices: [270],
    height: '400px',
}

If I replace device 270 by device 269 (which is a flow in l/min) then the graph of that device is shown as expected, so it seems to be specifically related to the device.