Stacktrace:

Generator crash.crash_pipeline.PublishResultPipeline(*(u'fracas', {u'channel': u'dev', u'platform': u'win', u'process_type': u'renderer', u'signature': u'[Renderer hang] content::ResourceDispatcher::StartSync', u'version': u'56.0.2922.1'}), **{})#310347e9e5fc467ba122b3d291fe4e77 raised exception. TypeError: 'NoneType' object does not support item assignment
Traceback (most recent call last):
  File "/base/data/home/apps/s~google.com:findit-for-me/crash-backend-fracas:katesonia.397223479409155947/first_party/pipeline_utils/appengine_third_party_pipeline_python_src_pipeline/pipeline.py", line 2158, in evaluate
    self, pipeline_key, root_pipeline_key, caller_output)
  File "/base/data/home/apps/s~google.com:findit-for-me/crash-backend-fracas:katesonia.397223479409155947/first_party/pipeline_utils/appengine_third_party_pipeline_python_src_pipeline/pipeline.py", line 1113, in _run_internal
    return self.run(*self.args, **self.kwargs)
  File "/base/data/home/apps/s~google.com:findit-for-me/crash-backend-fracas:katesonia.397223479409155947/crash/crash_pipeline.py", line 182, in run
    result = analysis.ToPublishableResult(self._crash_identifiers)
  File "/base/data/home/apps/s~google.com:findit-for-me/crash-backend-fracas:katesonia.397223479409155947/model/crash/crash_analysis.py", line 176, in ToPublishableResult
    appengine_util.GetDefaultVersionHostname(), self.key.urlsafe())
TypeError: 'NoneType' object does not support item assignment