If you go into spectator mode, no clip into the ground and press F3 + N to switch to creative, minecraft crashes.
---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 10/09/15 19:23
Description: Unexpected error

java.lang.ArrayIndexOutOfBoundsException: -1
at aqz.a(SourceFile:552)
at bap.b(SourceFile:152)
at bap.a(SourceFile:70)
at bap.a(SourceFile:53)
at bah.a(SourceFile:217)
at bkp.a(SourceFile:1036)
at azx.as(SourceFile:954)
at azx.a(SourceFile:377)
at net.minecraft.client.main.Main.main(SourceFile:125)

A detailed walkthrough of the error, its code path and all known details is as follows:
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– Head –
Stacktrace:
at aqz.a(SourceFile:552)
at bap.b(SourceFile:152)
at bap.a(SourceFile:70)
at bap.a(SourceFile:53)
at bah.a(SourceFile:217)