uranusjr commented on issue #19671:
URL: https://github.com/apache/airflow/issues/19671#issuecomment-972597390


   A none-checking will fix the exception, but not the issue. When 
`ti.queued_dttm` is set when the `ti` (task instance) is being queued for 
execution, and should not be None here because the fact this `ti` appears in 
the executor in the first place means it should have been queud for execution. 
So the problem is deeper than the sympton and needs a more involved fix than 
simply none-checking.


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