cubicweb #1568618 weird trace for all requests [rejected]

error while decoding json arguments for js_%s: %s (u'unload_page_data', (u'',), ValueError('No JSON object could be decoded',))
2011-03-28 11:11:55 - (cubicweb.web) ERROR: error while decoding json arguments for js_%s: %s
Traceback (most recent call last):
 File "/home/aurelien/src/fcw/cubicweb/web/views/basecontrollers.py", line 282, in publish
   args = [json.loads(arg) for arg in args]
 File "/usr/lib/python2.6/json/__init__.py", line 307, in loads
   return _default_decoder.decode(s)
 File "/usr/lib/python2.6/json/decoder.py", line 319, in decode
   obj, end = self.raw_decode(s, idx=_w(s, 0).end())
 File "/usr/lib/python2.6/json/decoder.py", line 338, in raw_decode
   raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
prioritynormal
typebug
done in<not specified>
load0.000
load left0.000
closed by<not specified>