import pywikibot
from pywikibot import config2 as config
config.simulate = True

repo = pywikibot.Site("test", "wikidata")
item = pywikibot.ItemPage(repo, 'Q167028')

item.get()
claim = pywikibot.Claim(repo, 'p31')
claim.setTarget('http://rien.de')
item.addClaim(claim)

SIMULATION: wbcreateclaim action blocked. ***

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-5-3167f370617b> in <module>()
      9 claim = pywikibot.Claim(repo, 'p31')
     10 claim.setTarget('http://rien.de')
---> 11 item.addClaim(claim)
     12 

/srv/paws/pwb/pywikibot/page.py in wrapper(self, *args, **kwargs)
    125             pywikibot.async_request(handle, func, self, *args, **kwargs)
    126         else:
--> 127             handle(func, self, *args, **kwargs)
    128 
    129     manage_wrapping(wrapper, func)

/srv/paws/pwb/pywikibot/page.py in handle(func, self, *args, **kwargs)
    107         err = None
    108         try:
--> 109             func(self, *args, **kwargs)
    110         # TODO: other "expected" error types to catch?
    111         except pywikibot.Error as edit_err:

/srv/paws/pwb/pywikibot/page.py in addClaim(self, claim, bot, **kwargs)
   4559         @type callback: callable
   4560         """
-> 4561         self.repo.addClaim(self, claim, bot=bot, **kwargs)
   4562         claim.on_item = self
   4563 

/srv/paws/pwb/pywikibot/site.py in callee(self, *args, **kwargs)
   1319             else:
   1320                 raise Exception("Not implemented")
-> 1321             return fn(self, *args, **kwargs)
   1322 
   1323         if not __debug__:

/srv/paws/pwb/pywikibot/site.py in addClaim(self, item, claim, bot, summary)
   7754         req = self._simple_request(**params)
   7755         data = req.submit()
-> 7756         claim.snak = data['claim']['id']
   7757         # Update the item
   7758         if claim.getID() in item.claims:

KeyError: 'claim'