recursion + keyerror issue with some wordnet synsets

Ran into an odd recursion and keyerror errors with a wordnet synset of "deny". Note that I abbreviated the 990 iterations of a part of the output.

[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
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>>> from pattern.en import wordnet as wn
>>> from pattern import __version__ as pattver
>>> pattver
'2.6'
>>> s = wn.synsets("deny", pos="VB")
>>> print(s[4].hypernyms(recursive=True))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  **** CHUNK REPEATED 990 TIMES ****
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/__init__.py", line 244, in hypernyms
    [p.extend(s.hypernyms(True, depth)) for s in list(p)]
  **** CHUNK REPEATED 990 TIMES ****
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/__init__.py", line 236, in hypernyms
    p = [Synset(p.getTarget()) for p in self._synset.getPointers(wn.HYPERNYM)]
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 722, in getTarget
    synset = getSynset(self.pos, self.targetOffset)
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 1090, in getSynset
    return _dictionaryFor(pos).getSynset(offset)
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 827, in getSynset
    return _entityCache.get((pos, offset), loader)
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 1310, in get
    if value == None:
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 472, in __cmp__
    return _compareInstances(self, other, ('pos', 'offset'))
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 1108, in _compareInstances
    elif a.__class__ != b.__class__:
RuntimeError: maximum recursion depth exceeded in cmp
>>> print(s[4].hypernyms(recursive=True))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/__init__.py", line 244, in hypernyms
    [p.extend(s.hypernyms(True, depth)) for s in list(p)]
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/__init__.py", line 236, in hypernyms
    p = [Synset(p.getTarget()) for p in self._synset.getPointers(wn.HYPERNYM)]
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 722, in getTarget
    synset = getSynset(self.pos, self.targetOffset)
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 1090, in getSynset
    return _dictionaryFor(pos).getSynset(offset)
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 827, in getSynset
    return _entityCache.get((pos, offset), loader)
  File "[HOME_DIR]/anaconda/envs/snorkel/lib/python2.7/site-packages/pattern/text/en/wordnet/pywordnet/wordnet.py", line 1309, in get
    del this.history[timestamp]
KeyError: 1003 

Reproduce the reported calls with pattern.en.wordnet, especially s[4].hypernyms(recursive=True) for "deny" with pos="VB". Read pattern/text/en/wordnet/init.py around Synset.hypernyms and pywordnet/wordnet.py around getTarget, getSynset, and _entityCache.get. Done means the recursion and KeyError are resolved for this reproduction.