CPU utilisation "null"

[JonyIvy]

I just installed signalk-rpi-monitor on a RPi CM4 with OpenPlotter 3 and the plugin is generally working. The temperatures are read and send correctly.
However, the values for cpu utilisation are all "null" in the data browser and on KIP and the memory utilisation doesn't show up at all.

The server log looks fine to me:

Mar 20 20:35:06 Mon, 20 Mar 2023 19:35:06 GMT signalk-rpi-monitor got cpu utilisation 20:35:06 all 6,09 0,00 1,71 0,00 0,00 0,05 0,00 0,00 0,00 92,15 20:35:06 0 6,64 0,00 1,61 0,00 0,00 0,20 0,00 0,00 0,00 91,55 20:35:06 1 5,62 0,00 2,21 0,00 0,00 0,00 0,00 0,00 0,00 92,17 20:35:06 2 7,66 0,00 1,61 0,00 0,00 0,00 0,00 0,00 0,00 90,73 20:35:06 3 4,44 0,00 1,41 0,00 0,00 0,00 0,00 0,00 0,00 94,15
Mar 20 20:35:06 Mon, 20 Mar 2023 19:35:06 GMT signalk-rpi-monitor cpu utilisation is 92,15
Mar 20 20:35:06 Mon, 20 Mar 2023 19:35:06 GMT signalk-rpi-monitor cpu utilisation core 0 is 91,55
Mar 20 20:35:06 Mon, 20 Mar 2023 19:35:06 GMT signalk-rpi-monitor cpu utilisation core 1 is 92,17
Mar 20 20:35:06 Mon, 20 Mar 2023 19:35:06 GMT signalk-rpi-monitor cpu utilisation core 2 is 90,73
Mar 20 20:35:06 Mon, 20 Mar 2023 19:35:06 GMT signalk-rpi-monitor cpu utilisation core 3 is 94,15
Mar 20 20:35:31 Mon, 20 Mar 2023 19:35:31 GMT signalk-rpi-monitor got gpu temp=64.7'C
Mar 20 20:35:31 Mon, 20 Mar 2023 19:35:31 GMT signalk-rpi-monitor gpu temp is 337.85
Mar 20 20:35:31 Mon, 20 Mar 2023 19:35:31 GMT signalk-rpi-monitor got cpu 64757
Mar 20 20:35:31 Mon, 20 Mar 2023 19:35:31 GMT signalk-rpi-monitor cpu temp is 337.91
Mar 20 20:35:31 Mon, 20 Mar 2023 19:35:31 GMT signalk-rpi-monitor got memory gesamt benutzt frei gemns. Puffer/Cache verfügbar Speicher: 7999828 1172320 5127272 106660 1700236 6596188 Swap: 102396 0 102396
Mar 20 20:35:31 Mon, 20 Mar 2023 19:35:31 GMT signalk-rpi-monitor got sd 51

Could there be a problem parsing the output of the system commands because my system is set to german language? (cpu utilisation uses comma for decimal separation and mem utilisation has german text in it)
Any known remedies?

[JonyIvy]

Asked the question in "Issues", probably fits better there.