Its bug of 18
Crash report:
---- Minecraft Crash Report ----
// Oops.

Time: 01/10/14 18:16
Description: Manually triggered debug crash

java.lang.Throwable
at bsu.r(SourceFile:1563)
at bsu.as(SourceFile:877)
at bsu.a(SourceFile:314)
at net.minecraft.client.main.Main.main(SourceFile:120)

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

– Head –
Stacktrace:
at cen.a(SourceFile:308)

– Affected level –
Details:
Level name: MpServer
All players: 61 total; [cio['spectredu78'/2132, l='MpServer', x=-34,41, y=9,00, z=-1,65], cip['adf-edb2dda33499'/77381, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['91f-0d4e603bb14d'/71193, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['b1d-db70435090ec'/66239, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['35c-6192f4320648'/78295, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['a95-0f4cd29252fa'/78277, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['e85-4c36de54f3d6'/76694, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['01f-369c1f9d5797'/71170, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['1ca-6d44ff728122'/78117, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['706-79da608b1092'/70304, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['5e1-ca924b71b285'/62209, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['d5a-11b6fd5c72ec'/75244, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['cf2-9b94f3153942'/73447, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['c44-bf44e6c8d177'/75897, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['e0e-2fa0401e8d34'/71703, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['6f3-2532df57908f'/74632, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['c33-aef8694f267e'/76093, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['cf2-69942705ea98'/79331, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['af5-0e6ee9faed39'/71208, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['da8-cffa94bc0771'/52722, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['e37-223c55637051'/73954, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['b34-51bccdf26390'/71483, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['554-4068a14611fa'/77924, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['3c8-9f9c365dcc7a'/74964, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['db8-b56cfabefbc8'/79561, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['eba-a156fa337b8b'/70951, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['884-1bde420cf3f2'/72422, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['5cf-cf2c2d9b0ae4'/71206, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['01c-ac0aa8d3f3a5'/77385, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['986-350a70337d7e'/76068, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['aba-6b22087d5869'/79565, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['e89-5e268a7b5a19'/42057, l='MpServer', x=0,00, y=67108863,97, z=0,00], cip['Juan1914HD'/78276, l='MpServer', x=-47,00, y=12,03, z=2,50], cip['RangerModZ'/66238, l='MpServer', x=17,16, y=10,65, z=29,47], cip['Pc_TimeHD'/75896, l='MpServer', x=-57,69, y=12,00, z=4,50], cip['chacuya11'/78116, l='MpServer', x=4,39, y=10,03, z=21,07], cip['Pelson98'/71702, l='MpServer', x=-0,66, y=15,00, z=2,00], cip['luca_x_3'/73446, l='MpServer', x=1,84, y=15,00, z=-4,04], cip['Spraid'/74631, l='MpServer', x=-23,03, y=10,00, z=25,53], cip['Aspire3630'/71169, l='MpServer', x=28,28, y=8,00, z=-24,97], cip['ActionGamerYT'/76693, l='MpServer', x=18,16, y=12,00, z=-27,66], cip['Wulfskin500'/76092, l='MpServer', x=-25,91, y=8,00, z=-25,33], cip['D3adOrLife'/70303, l='MpServer', x=-25,70, y=8,00, z=2,09], cip['alikarabudak'/71482, l='MpServer', x=1,62, y=5,90, z=19,06], cip['porchesinger'/76067, l='MpServer', x=21,35, y=8,00, z=0,25], cip['MRLLL29'/71205, l='MpServer', x=33,51, y=9,27, z=-26,38], cip['__Merlet__'/73953, l='MpServer', x=29,63, y=8,00, z=-25,00], cip['Edunao24'/77923, l='MpServer', x=30,06, y=8,71, z=-25,38], cip['TeaTea0ne'/71207, l='MpServer', x=38,50, y=10,00, z=-18,50], cip['Siixsty6'/79564, l='MpServer', x=15,35, y=10,15, z=29,44], cip['thesnipe95'/52721, l='MpServer', x=64,44, y=12,00, z=4,69], cip['Payro78'/77384, l='MpServer', x=23,75, y=-67,98, z=35,44], cip['Elogard'/74963, l='MpServer', x=14,66, y=10,00, z=27,53], cip['D3adOrSnip'/62208, l='MpServer', x=23,85, y=10,27, z=-28,38], cip['Felipe100PvP'/78294, l='MpServer', x=16,90, y=12,01, z=-25,93], cip['laclif76'/72421, l='MpServer', x=30,66, y=8,00, z=-27,44], cip['Maxinoxo'/71192, l='MpServer', x=0,46, y=5,62, z=16,79], cip['Espaish'/79560, l='MpServer', x=20,11, y=9,00, z=30,54], cip['EyeKube'/75243, l='MpServer', x=-47,16, y=13,50, z=3,88], cip['TheJuancaMC'/42056, l='MpServer', x=49,64, y=13,31, z=-1,01], cip['hammer_fan'/70950, l='MpServer', x=60,53, y=12,00, z=-0,69]]
Chunk stats: MultiplayerChunkCache: 440, 440
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: 0,00,15,00,0,00 - World: (0,15,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 977604 game time, 360120 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: ~_ERROR~ ClassCastException: amj cannot be cast to java.lang.String
Retry entities: 0 total; []
Server brand: BungeeCord (git:BungeeCord-Bootstrap:1.8-SNAPSHOT:"614a194":unknown)
Server type: Non-integrated multiplayer server
Stacktrace:
at cen.a(SourceFile:308)
at bsu.b(SourceFile:2252)
at bsu.a(SourceFile:323)
at net.minecraft.client.main.Main.main(SourceFile:120)

– System Details –
Details:
Minecraft Version: 1.8
Operating System: Windows Vista (x86) version 6.0
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 187662568 bytes (178 MB) / 330260480 bytes (314 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: 13, tallocated: 95
Launched Version: 1.8
LWJGL: 2.9.1
OpenGL: ATI Radeon HD 4800 Series GL version 3.3.11631 Compatibility Profile Context, 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)