red_chisq issue with SAMFire

samf_ red_chisq.py

SAM = m.create_samfire()
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-21-edd4774a10cd> in <module>()
----> 1 SAM = m.create_samfire()

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/model.py in create_samfire(self, workers, setup, **kwargs)
   1780         from hyperspy.samfire import Samfire
   1781         return Samfire(self, workers=workers,
-> 1782                        setup=setup, **kwargs)
   1783 
   1784 

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/samfire.py in __init__(self, model, workers, setup, **kwargs)
    192         self._workers = workers
    193         if len(kwargs) or setup:
--> 194             self._setup(**kwargs)
    195         self.refresh_database()
    196 

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/samfire.py in _setup(self, **kwargs)
    222                 self.pool = SamfirePool(**kwargs)
    223             self._workers = self.pool.num_workers
--> 224             self.pool.prepare_workers(self)
    225 
    226     def start(self, **kwargs):

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/samfire_utils/samfire_pool.py in prepare_workers(self, samfire)
    131         self.samf = samfire
    132         mall = samfire.model
--> 133         model = mall.inav[mall.axes_manager.indices]
    134         model.store('z')
    135         m_dict = model.signal._to_dictionary(False)

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/model.py in __getitem__(self, slices)
   1847         for k in twin_dict.keys():
   1848             for tw_id in twin_dict[k][0]:
-> 1849                 twin_dict[tw_id][1].twin = twin_dict[k][1]
   1850 
   1851         _model.chisq.data = _model.chisq.data.copy()

KeyError: 4410591016