apt problem with zodb3

Hi, I have this strange error now on my debian stretch system:

Error processing line 1 of 
/usr/local/lib/python3.5/dist-packages/zodb.py3migrate-nspkg.pth:

   Traceback (most recent call last):
     File "/usr/lib/python3.5/site.py", line 173, in addpackage
       exec(line)
     File "<string>", line 1, in <module>
     File "<frozen importlib._bootstrap>", line 574, in module_from_spec
   AttributeError: 'NoneType' object has no attribute 'loader'

Remainder of file ignored

Any ideas how to fix this?


Thank you in advance,


Etienne


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