when my sister tries to play a world, it loads then crashes

When my sister trys to play a world, when it loads it crashes, my username is Gerry9000, if this doesn't get fixed, im telling everyone about these bugs, and I'll stop playing MCPC and instead play a different game

Minecraft is the worlds greatest game, but its the worlds most bugiest game, I have 80,000 people to say im correct in the world, because I met them in minecraft

You need to fix every bug in minecraft or, no one will play it!