RodrigoDLopez commented on pull request #4282:
URL: https://github.com/apache/cloudstack/pull/4282#issuecomment-700736138


   Hi @ravening, that was my fault.
   You are doing a live migration, this NPE will occur when you: 
   - stop an instance;
   - migrate it with volume
   - do not start the instance
   - try to migrate again to another pool
   
   with these steps, after the first migrate `host_id` and `last_host_id` will 
be set to `null`. And then, when you try to migrate it again a NPE will be 
thrown.


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