Grafana - PRTG with error "Cannot read properties of null (reading ‘1’)"

  • What Grafana version and what operating system are you using?

  • What are you trying to achieve?
    I am trying to get information from PRTG and make a graph on Grafana.

  • How are you trying to achieve it?
    I already configured PRTG data source without any problems because I could see data (Group, Host, Sensor, Channel) from PRTG.

  • What happened?
    I could see an error on Grafana graph.
    The error is “Cannot read properties of null (reading ‘1’)”.

  • What did you expect to happen?
    I would like to see the graph.

  • Can you copy/paste the configuration(s) that you are having problems with?

  • Did you receive any errors in the Grafana UI or in related logs? If so, please tell us exactly what they were.
    The error is “Cannot read properties of null (reading ‘1’)”.

  • Did you follow any online instructions? If so, what is the URL?

When I executed the below link, I got the data.
Got this data:
{“prtg-version”:“”,“treesize”:5,“histdata”:[{“datetime”:“2023-08-23 09:04:21”,“Value”:80.0000,“coverage”:“100 %”},{“datetime”:“2023-08-23 09:05:21”,“Value”:81.0000,“coverage”:“100 %”},{“datetime”:“2023-08-23 09:06:21”,“Value”:72.0000,“coverage”:“100 %”},{“datetime”:“2023-08-23 09:07:21”,“Value”:82.0000,“coverage”:“100 %”},{“datetime”:“2023-08-23 09:08:21”,“Value”:87.0000,“coverage”:“100 %”}]}

However, I got an error “No Data” on Grafana. Please anyone help me out?
The error is “Cannot read properties of null (reading ‘1’)”.