exception on login

[10/Mar/2015:14:30:21] HTTP Traceback (most recent call last):
File “/srv/vispa/python/local/lib/python2.7/site-packages/cherrypy/_cprequest.py”, line 670, in respond
response.body = self.handler()
File “/srv/vispa/vispa/tools/template.py”, line 30, in _do_render
data = request._mako_inner_handler(args,*kwargs)
File “/srv/vispa/python/local/lib/python2.7/site-packages/cherrypy/_cpdispatch.py”, line 61, in call
return self.callable(self.args,*self.kwargs)
File “/srv/vispa/vispa/controller/root.py”, line 122, in index
parse_json=True)
File “/srv/vispa/vispa/controller/root.py”, line 84, in get_preferences
parsed_preference[key2] = JSON.loads(value2)
File “/usr/lib/python2.7/json/init.py”, line 326, in loads
return _default_decoder.decode(s)
File “/usr/lib/python2.7/json/decoder.py”, line 365, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File “/usr/lib/python2.7/json/decoder.py”, line 381, in raw_decode
obj, end = self.scan_once(s, idx)
ValueError: end is out of bounds

(from redmine: issue id 2167, created on 2015-03-10 by gmueller, closed on 2015-03-10)