As far as we humans are concerned, pretty close... It might not mean immediate destruction if it doesn't hit Earth, but it will certainly throw a spanner in the delicate, fine-tuned orbital system, resulting in orbits changing and bad things eventually happen.
That been said, it doesn't really have to hit anything (unlikely anyway), a simple flyby of a weighty Earth-sized planet would create enough perturbations in the inner planets' orbits, and most certainly eject a massive hailstorm of asteroids out from the eponymous belt.