Worldmap Panel: TypeError: o is undefined

Hi,
I visualized a current position (lat lng) in a Worldmap Panel with Grafana 5.2.2 and WorldmapPanel 0.1.2 and it worked well.
Now I would also like to do it with Grafana 6.7.3 and WorldmapPanel 0.3.2. But I always get the error “TypeError: o is undefined”.
What could cause that?

I update Grafana to 7.0.3 but get the same error.
With a newly restarted grafana-server I can create the panel and visualize a data point.
But when I reload the page the point is dissapeared and the error message “Data error: TypeError: o is undefined” is thrown.

Dear @janna,

you might be successful with the Worldmap fork we are maintaining at GitHub - panodata/panodata-map-panel: Map Panel for Grafana with improved convenience, robustness and features. Friendly fork of the original Grafana Worldmap Panel. Currently not maintained, but verified to work up to Grafana 9.. We just published version 0.15.0 including many improvements from the community and our own pen.

With kind regards,
Andreas.