error when activating akumuli data source in grafana

[igor-zacharov]

When activating data-source akumuli (version 1.3.11)
in grafana (version 6.7.2) after "Save&Test" the error is displayed:
Failed to execute 'fetch' on 'Window': Request with GET/HEAD method cannot have body.

This error does not seem to have impact on fetching data when going forward using the system.
Still, would be nice to eliminate.

Another remark. In the "Akumuli Settings" window on the same data-source page the version is displayed as ==0.7 which is not changeable and does not relate to the version installed.

Thank you, Igor.