500 Server error

The training database corrupted today, so I have started training a new 
database.
Now, sometimes training occurs with no errors; other time I get the 
message below.
What does it mean and what can I do to fix it?

Spambayes 1.1b1 and python 2.7.2 on Debian Wheezy.


      *500 Server error*

*Traceback (most recent call last):

   File "/usr/lib/python2.7/dist-packages/spambayes/Dibbler.py", line 477, in found_terminator
     getattr(plugin, name)(**params)

   File "/usr/lib/python2.7/dist-packages/spambayes/ProxyUI.py", line 287, in onReview
     stats_as_ham, old_class=old_class)

   File "/usr/lib/python2.7/dist-packages/spambayes/Stats.py", line 127, in RecordTraining
     self.messageinfo_db.set_persistent_statistics(self.totals)

   File "/usr/lib/python2.7/dist-packages/spambayes/message.py", line 135, in set_persistent_statistics
     self.db[STATS_STORAGE_KEY] = stats

   File "/usr/lib/python2.7/shelve.py", line 133, in __setitem__
     self.dict[key] = f.getvalue()

   File "/usr/lib/python2.7/shelve.py", line 79, in closed
     raise ValueError('invalid operation on closed shelf')

ValueError: invalid operation on closed shelf
*


Thanks,
Dale

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