Sending packet/NullPointerException

Attempting to play the world crashes the game on load every time, resulting in the following crash report. Upon further testing I found the world only crashes on load when the game is in full screen. In windowed mode it opens fine, and can be switched into full screen without issue. However, quitting then trying to open the world again while in full screen, without ever closing out of the Minecraft launcher, still crashes the game (oddly with it saying it exited normally, without creating a crash report).