I created a superflat world, starting with classic but adding a layer of air, and a layer of tripwires. The resulting world crashes the client about 1 second after loading.
I've attached the world I made that causes the crash. I reproduced the crash both on the released version and on the most recent snapshot.
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I could not find any existing issue that contains any of the crashes mentioned here. However, all of the crash reports that you have provided are from a modded version of Minecraft. Please try to reproduce the crash in a vanilla (non-modded) version of Minecraft and attach that report or this may be dismissed as being caused by a mod.
Duplicate of MC-1510
Please attach the crash report as text file here.