lukecwik commented on pull request #12241:
URL: https://github.com/apache/beam/pull/12241#issuecomment-658244351


   > Could you please explain more about the race condition here?
   
   threadsafe_watermark_estimator can become None in the finally block after 
the `if threadsafe_restriction_tracker:` check has passed which will lead to a 
`NoneType doesn't have a get_estimator_state` method.


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