Gregory Petrosyan created AIRFLOW-581:

             Summary: "Recent statuses" widget not working; related SQL 
exception on "Chart" page
                 Key: AIRFLOW-581
             Project: Apache Airflow
          Issue Type: Bug
    Affects Versions: Airflow
            Reporter: Gregory Petrosyan

I am following the quick start (

After successfully running backfill for `example_bash_operator` from CLI, 
"Recent statuses" widget is empty. However, various DAG views for this DAG show 
valid data; so the database is not empty.

Additionally, default «Airflow task instance by type» chart, which does
SELECT state, COUNT(1) as number FROM task_instance WHERE dag_id LIKE 
'example%' GROUP BY state

shows an error «SQL execution failed. Details: 'NoneType' object has no 
attribute 'get_pandas_df'». This looks related to not working "recent statuses" 

This issue was reported externally before:

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