In the latest snapshot (18w19b), I seem to crash 100% of the time whenever I reach a certain area in the seed 1225964276. I attempted to have the render distance set to low and lowered all graphics and it still crashes. My guess is that the game is trying to generate a structure or terrain/biome when I approach it and that generation failed somehow and caused a crash in the process. 

To recreate the crash, follow these steps:

-Go to snapshot 18w19b

-Create a world with the seed 1225964276

-Teleport to -82, 90, -1000

-Fly/walk in the negative z direction and you will crash when you reach around -82, 90, -1075

Let me know if any additional information is required but hopefully you can recreate this issue with the given steps.