game crashed for unknown reason

Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 15. 2. 28 오후 5:51
Description: Manually triggered debug crash

java.lang.Throwable
at avf.s(SourceFile:1587)
at avf.av(SourceFile:888)
at avf.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bdc.a(SourceFile:309)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bex['butterbeer6778'/0, l='MpServer', x=326.64, y=56.00, z=239.91]]
Chunk stats: MultiplayerChunkCache: 30, 30
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: 316.00,4.00,224.00 - World: (316,4,224), Chunk: (at 12,0,0 in 19,14; contains blocks 304,0,224 to 319,255,239), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 9080 game time, 9080 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 1 total; [bex['butterbeer6778'/0, l='MpServer', x=326.64, y=56.00, z=239.91]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bdc.a(SourceFile:309)
at avf.b(SourceFile:2296)
at avf.a(SourceFile:334)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.8.3
Operating System: Windows 8.1 (x86) version 6.3
CPU: 2x AMD E-300 APU with Radeon(tm) HD Graphics
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 183940184 bytes (175 MB) / 418693120 bytes (399 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8.3
LWJGL: 2.9.4
OpenGL: AMD Radeon HD 6310 Graphics GL version 4.3.12618 Compatibility Profile Context 13.251.9001.0, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)