Whenever you explode a certain amount of beds in the nether, your game just freezes for a short period, then closes (crashes). It isn't caused by the entities, but rather from repetitive explosions themselves.

How to replicate:

1. Set up an obsidian box for yourself and 2 obsidian in front to place and explode beds repetitively.
2.  Start placing and exploding beds, after about 20 seconds of spamming, your game should crash.