File "/base/data/home/apps/s~findit-for-me/waterfall-backend:77a2064.397553395604744766/first_party/pipeline_utils/appengine_third_party_pipeline_python_src_pipeline/pipeline.py", line 2207, in evaluate
    yielded = pipeline_iter.send(next_value)
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:77a2064.397553395604744766/waterfall/start_try_job_on_demand_pipeline.py", line 77, in run
    heuristic_result, force_try_job)
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:77a2064.397553395604744766/waterfall/try_job_util.py", line 321, in NeedANewTryJob
    if _ShouldBailOutForOutdatedBuild(build):
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:77a2064.397553395604744766/waterfall/try_job_util.py", line 22, in _ShouldBailOutForOutdatedBuild
    return (time_util.GetUTCNow() - build.start_time).days > 0
TypeError: unsupported operand type(s) for -: 'datetime.datetime' and 'NoneType'