Leap register-and-delete-user test fails

I redeployed latest leap_platform:develop today, that fixed #6821. However, the register-and-delete-user test fails now:

--- git/bitmask ‹master* M› » leap test chameleon
 = [chameleon.unstable.bitmask.net] PASS: Network > Can connect to internet?
 = [chameleon.unstable.bitmask.net] PASS: Network > Is stunnel running?
 = [chameleon.unstable.bitmask.net] PASS: Network > Is shorewall running?
 = [chameleon.unstable.bitmask.net] PASS: Webapp > Can contact couchdb?
 = [chameleon.unstable.bitmask.net] PASS: Webapp > Can contact couchdb via haproxy?
 = [chameleon.unstable.bitmask.net] PASS: Webapp > Are daemons running?
 = [chameleon.unstable.bitmask.net] PASS: Webapp > Can access webapp?
 = [chameleon.unstable.bitmask.net] FAIL: Webapp > Can create and authenticate and delete user via API? [webapp.rb:46]:
 = [chameleon.unstable.bitmask.net]   Expected a 200 status code from POST https://api.unstable.bitmask.net:4430/1/sessions.json, but got 500 instead.
 = [chameleon.unstable.bitmask.net]   {"error":"The server failed to process your request. We'll look into it (RestClient::ResourceNotFound)."}
 = [chameleon.unstable.bitmask.net] Tests halted on failure (because of --no-continue).
 = bailing out 

(from redmine: created on 2015-04-07, closed on 2015-04-10)