kaxil commented on a change in pull request #12910:
URL: https://github.com/apache/airflow/pull/12910#discussion_r538851306



##########
File path: airflow/models/taskinstance.py
##########
@@ -773,7 +773,7 @@ def get_previous_start_date(
         """
         self.log.debug("previous_start_date was called")
         prev_ti = self.get_previous_ti(state=state, session=session)
-        return prev_ti and prev_ti.start_date
+        return prev_ti and prev_ti.start_date and 
pendulum.instance(prev_ti.start_date)

Review comment:
       I would rather have:
   
   ```
   return prev_ti and prev_ti.start_date is not None and 
pendulum.instance(prev_ti.start_date)
   ```
   Although my brain is not working right now. Looping in @ashb @turbaszek 
@XD-DENG for reviews




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