Error 400 when Rating.

Perhaps is not a really functional error.
Because I detected it with the Firebug tool.

How to reproduce:

• I'm at this Artist page http://musicbrainz.org/artist/bbc5b66b-d037-4f26-aecf-0b129e7f876a
• I click on the stars in one album.
• When clicking, I can see on the firbug these requests:

  http://musicbrainz.org/rating/rate?entity_id=50639&entity_type=release_group&rating=80&json=1
  http://musicbrainz.org/rating/rate/musicbrainz.org/rating/rate?entity_id=50639&entity_type=release_group&rating=80?JSON=1
  

• The first request is OK. But the second is responded with a HTTP 400 error.

I've tryed some times right now. Using firefox.

Important?
don't know

My first jira with you, guys!
Zequi