%pdoc throws TypeError

[cdeil]

When I run %pdoc on a class of mine I get the following TypeError and afterwards my ipython shell is messed up, e.g. image.pgs.GPSPlot? prints the same info twice.

In [1]: import image.gps

In [2]: %pdoc image.gps.GPSPlot

TypeError Traceback (most recent call last)
/Users/deil/ in ()
----> 1 get_ipython().magic(u"pdoc image.gps.GPSPlot")

/Users/deil/github/ipython/IPython/core/interactiveshell.pyc in magic(self, arg_s, next_input)
1892 self._magic_locals = sys._getframe(1).f_locals
1893 with self.builtin_trap:
-> 1894 result = fn(magic_args)
1895 # Ensure we're not keeping object references around:

1896 self._magic_locals = {}

/Users/deil/github/ipython/IPython/core/magic.pyc in magic_pdoc(self, parameter_s, namespaces)
585 If the given object is a class, it will print both the class and the
586 constructor docstrings."""
--> 587 self._inspect('pdoc',parameter_s, namespaces)
588
589 def magic_psource(self, parameter_s='', namespaces=None):

/Users/deil/github/ipython/IPython/core/interactiveshell.pyc in _inspect(self, meth, oname, namespaces, *_kw)
1374 formatter = format_screen if info.ismagic else None
1375 if meth == 'pdoc':
-> 1376 pmethod(info.obj, oname, formatter)
1377 elif meth == 'pinfo':
1378 pmethod(info.obj, oname, formatter, info, *_kw)

/Users/deil/github/ipython/IPython/core/oinspect.pyc in pdoc(self, obj, oname, formatter)
307 indent(ds),
308 head("Constructor Docstring:"),
--> 309 indent(init_ds)])
310 elif (type(obj) is types.InstanceType or isinstance(obj,object))
311 and hasattr(obj,'call'):

TypeError: sequence item 3: expected string, NoneType found

{'commit_hash': '2eb3a49',
'commit_source': 'repository',
'ipython_path': '/Users/deil/github/ipython/IPython',
'ipython_version': '0.11.dev',
'os_name': 'posix',
'platform': 'Darwin-10.8.0-i386-64bit',
'sys_executable': '/opt/local/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python',
'sys_platform': 'darwin',
'sys_version': '2.7.2 (default, Jun 25 2011, 11:09:57) \n[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]'}

I am using the iTerm 0.10 shell.