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Is this a bug?

Definitely yes. Especially with the "No backtrace available" you mention. But since you don't tell us what you were trying to do, it is pretty hard to divine the cause of the problem : in the plotting action, or in computing what you were trying to plot...

You should try to post a documented example (i. e. an actual attempt at plotting something and the complete answer of the system) on sage-support, where a developper might help you better than I can with so few details. (S)he might also be able to help you file a ticket.