On Grafana 6.7 - Status panel not working "Panel rendering error "

I updated Grafana 6.5 to 6.7 , from that on status panel not working .
I tried to do some changes in the status panel config and it says
“Panel rendering error
Cannot read property ‘slice’ of undefined”

Do you mean this plugin? https://grafana.com/grafana/plugins/vonage-status-panel

That error maybe is due to the query not returning any data (is just a bad error message).

Might be worth opening an issue for the plugin here

Yeah sure, there is the open issue already in the plugin link you mentioned thanks