You have a memory leak.
[13:13:18] [Client thread/INFO]: Setting user: KKuurus
[13:13:18] [Client thread/INFO]: (Session ID is token:93577832c0924bd5a2aa0872be4e57f9:e65c09d731ff456fb5753fef70315f12)
[13:13:20] [Client thread/INFO]: LWJGL Version: 2.9.1
[13:13:20] [Client thread/INFO]: Reloading ResourceManager: Default
[13:13:22] [Sound Library Loader/INFO]: Starting up SoundSystem...
[13:13:22] [Client thread/WARN]: File minecraft:sounds/mob/ghast/fireball.ogg does not exist, cannot add it to event minecraft:item.fireCharge.use
[13:13:22] [Thread-6/INFO]: Initializing LWJGL OpenAL
[13:13:22] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[13:13:22] [Thread-6/INFO]: OpenAL initialized.
[13:13:22] [Sound Library Loader/INFO]: Sound engine started
[13:13:23] [Client thread/INFO]: Created: 512x512 textures-atlas
[13:13:33] [Server thread/INFO]: Starting integrated minecraft server version 1.8
[13:13:33] [Server thread/INFO]: Generating keypair
[13:13:33] [Server thread/INFO]: Preparing start region for level 0
[13:13:34] [Server thread/INFO]: Preparing spawn area: 42%
[13:13:35] [Server thread/INFO]: KKuurus[local:E:245a2020] logged in with entity id 274 at (-2284.7901587182296, 63.0, -637.6452785069594)
[13:13:35] [Server thread/INFO]: KKuurus joined the game
[13:13:37] [pool-2-thread-1/WARN]: Couldn't look up profile properties for com.mojang.authlib.GameProfile@10ebc92[id=e65c09d7-31ff-456f-b575-3fef70315f12,name=KKuurus,properties={},legacy=false]
com.mojang.authlib.exceptions.AuthenticationException: The server encountered an unexpected condition which prevented it from fulfilling the request
at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:65) ~[authlib-1.5.17.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillGameProfile(YggdrasilMinecraftSessionService.java:158) [authlib-1.5.17.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(YggdrasilMinecraftSessionService.java:53) [authlib-1.5.17.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(YggdrasilMinecraftSessionService.java:50) [authlib-1.5.17.jar:?]
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache.get(LocalCache.java:3934) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4827) [guava-17.0.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:148) [authlib-1.5.17.jar:?]
at cvz.run(SourceFile:105) [1.8.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_67]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_67]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_67]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_67]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_67]
[13:23:43] [Client thread/ERROR]: ########## GL ERROR ##########
[13:23:43] [Client thread/ERROR]: @ Post render
[13:23:43] [Client thread/ERROR]: 1285: Out of memory
[13:23:46] [Client thread/ERROR]: ########## GL ERROR ##########
[13:23:46] [Client thread/ERROR]: @ Post render
[13:23:46] [Client thread/ERROR]: 1286: Invalid framebuffer operation