Steps to reproduce:

1. Open the launcher and use the "Quick Play" function to select a world you'd like to launch.
2. Click said world and wait for the game to load.
3. As soon as you enter the title screen, quickly press play and select the same world you attempted to Quick Play.

Observed results:
The game freezes and crashes

Expected results:
The game won't crash.

Original description:
I keep accidently quick launching a world and forgetting I quick launched the world, so I open the world in-game and the game crashes.