Workspace Crash when GraphQL-Introspection returns unexpected Response

My GraphQL-Endpoint in Development sometimes answers with HTML. In previous versions, this showed a small error that the introspection failed - which was perfect.
Now, the whole Yaak-Workspace is removed and shows presumably the output of an Error Boundary.
This makes the app somewhat hard to use, because now I cannot send any request at all.

A quick fix would be greatly appreciated.