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https://issues.apache.org/jira/browse/AIRFLOW-3777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ash Berlin-Taylor resolved AIRFLOW-3777.
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Resolution: Duplicate
> unsupported operand type(s) for +=: 'int' and 'NoneType' exception in
> duration view
> -----------------------------------------------------------------------------------
>
> Key: AIRFLOW-3777
> URL: https://issues.apache.org/jira/browse/AIRFLOW-3777
> Project: Apache Airflow
> Issue Type: Bug
> Components: webserver
> Affects Versions: 1.10.1
> Reporter: Emmanuel Brard
> Priority: Minor
>
> The duration view fails with exception: `TypeError: unsupported operand
> type(s) for +=: 'int' and 'NoneType'` because the table `task_fail` contains
> records with missing start_date and duration.
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