Uncaught Error: Metrics view

I’m running nexus 3.20.1-01
when clicking on “Metrics”, the following error is raised

Uncaught Error: You’re trying to decode an invalid JSON String: (https://nexus-../static/rapture/baseapp-prod.js?_v=3.20.1-01&_e=OSS:1)

I’ve inspected XHR with debugger.
The response is Empty (0 bytes)
But if I open the url in my browser
I get data

thank to help me