crash

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What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. So i go to the nether in creative mode and when it finishes loading after a few seconds i start to see ghasts , zombiepigmen and lavaslimes and then the game just crashes .
2. Every time i restart the world the same thing happens and when i go into the files and delete myself from players and go back in there i appear in the nether and the same thing happens .
3. I've tried switching back to older versions but nothing has worked . I dont know if it would matter but i play on mac .