Well, if you have logs saying that the job finished at 22:01 then I don't see how the server could have crashed at any time between 21:50 and 22:00.

What evidence do you have of a crash? Does the server reboot? Is there a message on the console? Is there a dump in /var/crash or some other location based on how your system is set up? Do you have messages in your system logs? Any one of those would be much more helpful than just the command you were running at the time.