Time paradox

Imagine an inventor who has a robot servant able to predict the future, even if just for a few seconds. The robot is programmed to follow its master's wish as soon as it becomes aware of them. The master is eating dinner, and the robot knows that just a few seconds into the future, he will say "pass the salt, plase". So it gives him the salt. But now when he have the salt, he will never ask for the salt in the first place. And since he will never ask for it, the robot will never receive the order from the future, and will therefore not give it to him. But if he doesn't give him the salt, he will need to ask for it, and then we are back to start.