PubSubIntegrationTest failing in post-commit

11:44:31 ======================================================================
11:44:31 ERROR: test_streaming_with_attributes (apache_beam.io.gcp.pubsub_integration_test.PubSubIntegrationTest)
11:44:31 ----------------------------------------------------------------------
11:44:31 Traceback (most recent call last):
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/sdks/python/apache_beam/io/gcp/pubsub_integration_test.py", line 199, in test_streaming_with_attributes
11:44:31     self._test_streaming(with_attributes=True)
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/sdks/python/apache_beam/io/gcp/pubsub_integration_test.py", line 191, in _test_streaming
11:44:31     timestamp_attribute=self.TIMESTAMP_ATTRIBUTE)
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/sdks/python/apache_beam/io/gcp/pubsub_it_pipeline.py", line 91, in run_pipeline
11:44:31     result = p.run()
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/sdks/python/apache_beam/pipeline.py", line 420, in run
11:44:31     return self.runner.run_pipeline(self, self._options)
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/sdks/python/apache_beam/runners/direct/test_direct_runner.py", line 51, in run_pipeline
11:44:31     hc_assert_that(self.result, pickler.loads(on_success_matcher))
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/build/gradleenv/1398941891/lib/python3.7/site-packages/hamcrest/core/assert_that.py", line 43, in assert_that
11:44:31     _assert_match(actual=arg1, matcher=arg2, reason=arg3)
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/build/gradleenv/1398941891/lib/python3.7/site-packages/hamcrest/core/assert_that.py", line 49, in _assert_match
11:44:31     if not matcher.matches(actual):
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/build/gradleenv/1398941891/lib/python3.7/site-packages/hamcrest/core/core/allof.py", line 16, in matches
11:44:31     if not matcher.matches(item):
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/build/gradleenv/1398941891/lib/python3.7/site-packages/hamcrest/core/base_matcher.py", line 28, in matches
11:44:31     match_result = self._matches(item)
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/sdks/python/apache_beam/io/gcp/tests/pubsub_matcher.py", line 91, in _matches
11:44:31     return Counter(self.messages) == Counter(self.expected_msg)
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/build/gradleenv/1398941891/lib/python3.7/collections/__init__.py", line 566, in __init__
11:44:31     self.update(*args, **kwds)
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/build/gradleenv/1398941891/lib/python3.7/collections/__init__.py", line 653, in update
11:44:31     _count_elements(self, iterable)
11:44:31   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python37_PR/src/sdks/python/apache_beam/io/gcp/pubsub.py", line 83, in __hash__
11:44:31     self.message_id, self.publish_time.seconds,
11:44:31 AttributeError: 'NoneType' object has no attribute 'seconds'