warrenstephens commented on issue #15607:
URL: https://github.com/apache/airflow/issues/15607#issuecomment-875567764


   @kaxil **I found the issue!**  
   
   It turns out that I had a minimized window open with the 
`http://localhost:8080/graph?dag_id=tutorial` in it!  This was from doing the 
tutorial walkthru days prior with some other folks.
   
   Now that I have closed that window the Airflow webserver exception no longer 
occurs (as shown in the screenshot above).
   
   I guess that the minimized window was reconnecting to airflow and attempting 
to get info on the tutorial dag that it assumed was still serialized.


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