Solipsism
Denial of material existence, in itself, is not solipsism. Solipsism also rejects or doubts that other people exist. As an epistemological view, it is the concept that nothing but one's own mind can be certain to exist. The existence of other minds, in this view, is considered a possibility, but not certainty. And even time does not stop just because there would be nobody to experience it (which is probably going to happen in the end of the universe when there would be simply nothing)