Will my mug be able to handle being microwaved?

My aunt came back from Disney World yesterday. As a souvenir, she gave me a mug. Usually on the bottom, it either says “microwave safe” or “not microwave safe.” The bottom of my mug says neither. Help? The reason I put this in general is because I don’t want to hurt myself or anyone else with shards of glass. Otherwise, I would have placed it in social.