If the dragon pedestal (highest block at x=0 z=0 in the end) is too high (approaching y=255), the game will sometimes crash when the dragon sits on top of it.

Recreation:

1. Create a new creative mode, singleplayer world
2. /setblock ~ ~ ~ end_portal    to enter the End
3. /setblock 0 255 0 minecraft:end_stone
4. Wait a few minutes (it isn't very long) and the game will crash

Please fix this, I am trying to build a cool dragon-based farm, and it's really annoying when the game crashes every 2 minutes. It's a really bad problem and has been tested on multiple different computers (they were all macs if it makes a difference). I fear this could be used as a weapon to EASILY crash any server (I haven't tested on servers, but it's a server crash report and not a client one).

Attached below is the bug report; the "mod" it mentions was just OptiFine, and I tested that the bug also occurs in vanilla.