What a good day to start Minecraft session!

-Nice evening started from you creating new world, calling it then running-

-You started to play,you spent two hours playing, you've built house, chicken farm and built portal because you've settled around lava lake.Just then you noticed bedrock in sky...What?-

-You continued play, just when you randomly tapped button tab,and see that turns out some player called Null is in your world,but it's not even open for multiplayer-