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?