JSON importer stopped working

Hi,
Thanks for this great plugin. I have been using it for years to get my Garmin Connect data on my WordPress site. However, now something has changed and I have to switch off the plugin.
If not, I get the error: neither object nor array? not implemented yet
please open ticket at ww.wp.xz.cn problems with JSON-structure: check basenode-param

The JSON feed still looks fine: https://connect.garmin.com/proxy/activitylist-service/activities/baghuis?start=1&limit=1

What is wrong with the setup? See my page here: https://casper.baghuis.nl/2015/11/09/garmin-connect-wordpress
The plugin is now deactivated.

Thanks,
Casper