Can't connet with GraphQL to Gridsome data

Hi all
i star use gitpod about few weeks ago, its really great!
But i had some issues to read data with Gridsome GraphQL

i use URL like this to access to GraphQL Playground: https://8080… … …gitpod.io/___explore

Access is granted, but on every query i get current error:

{
“error”: “Unexpected end of JSON input”
}

Any idea? Thanks

Howdy @Lowell130 could you please share a link to a git repository that reproduces the issue?