Multistat error after update Grafana to 7

Hello together,

After update to newest Gravana addon multistat doesn’t work!
I get following message, the graph is empty!

I don’t use time series as result!

… result I select „table“
With old Version of grafana (5,xx) i haven’t any error with multistat addon!

After I update to Grafana 7 beta I get the error!

If hope someone can give me a hint!