Vnstat2 XHR request timed out accessing config

Howdy! I'm using vnstat2 to track bandwidth usage, and it's working great.

Going to /cgi-bin/luci/admin/status/vnstat2/graphs shows all my graphs, and everything looks good.

However, if I go to 'cgi-bin/luci/admin/status/vnstat2/graphs, I get an error: "XHR request timed out" and it will not display the config.

I've looked through the logs, and haven't seen any messages from vnstat2 or Luci. Any tips on debugging this?

Thanks!