Application error (at huge relations)

Hi all,

many huge relations show “Application error”, e.g.

Browser = Firefox (Windows)
Application error
The OpenStreetMap server encountered an unexpected condition that prevented it from fulfilling the request (HTTP 500)
Feel free to contact the OpenStreetMap community if your problem persists. Make a note of the exact URL / post data of your request.
This may be a problem in our Ruby On Rails code. 500 occurs with exceptions thrown outside of an action (like in Dispatcher setups or broken Ruby code)