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https://issues.apache.org/jira/browse/AIRFLOW-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941325#comment-15941325
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Jeeyoung Kim commented on AIRFLOW-1017:
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I just ran into this issue. Thanks for resolving!
> get_task_instance should return None instead of throw an exception for
> non-existent TIs
> ---------------------------------------------------------------------------------------
>
> Key: AIRFLOW-1017
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1017
> Project: Apache Airflow
> Issue Type: Bug
> Reporter: Dan Davydov
> Assignee: Dan Davydov
> Priority: Critical
>
> We were seeing errors in our scheduler like the following due to this issue:
> File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line
> 2796, in one
> raise orm_exc.NoResultFound("No row was found for one()")
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