I tried to make custom superflat world, but my game crashed at I clicked 'Customize' button.
IDK It crashes with other language.
Environment
[ CPU ] Intel Core i5 2310 / Quadcore
[ Ram ] DDR3 12G, 3 of 4 slots used
[ Graphic ] NVIDIA GeForce GTX 550 Ti
[ OS ] Windows 7 Home Premium K 64-bit / Service pack 1 / ko-kr
[ Java ] Minecraft Default Runtime
[ JVM ] Default
[ Language ] 한국어 ( 한국 )
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However, this issue has been closed as a Duplicate of MC-115802.
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