I was in the End, in survival, flying with my Elytra and as I was getting too low, I threw an Enderpearl to reach blocks and that's when it crashed.

PS : I may have already send the report via Hopper, not sure though.

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 02/12/15 18:19
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bkg.a(SourceFile:373)
at bbz.au(SourceFile:1450)
at bbz.ax(SourceFile:1934)
at bbz.aw(SourceFile:1752)
at bbz.s(SourceFile:1596)
at bbz.as(SourceFile:942)
at bbz.a(SourceFile:386)
at net.minecraft.client.main.Main.main(SourceFile:122)

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

– Head –
Stacktrace:
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bkg.a(SourceFile:373)
at bbz.au(SourceFile:1450)
at bbz.ax(SourceFile:1934)
at bbz.aw(SourceFile:1752)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bmg['URoulon'/161, l='MpServer', x=-82,88, y=21,06, z=64,44]]
Chunk stats: MultiplayerChunkCache: 699, 699
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 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: 101455 game time, 1000 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: 58 total; [yo['Enderman'/3840, l='MpServer', x=-61,50, y=57,00, z=94,50], yo['Enderman'/3713, l='MpServer', x=-18,50, y=60,00, z=41,50], yo['Enderman'/3714, l='MpServer', x=-9,50, y=61,00, z=43,84], yo['Enderman'/3715, l='MpServer', x=-20,50, y=60,00, z=42,50], yo['Enderman'/3716, l='MpServer', x=-24,50, y=60,00, z=41,50], yo['Enderman'/3717, l='MpServer', x=-11,50, y=59,00, z=75,50], yo['Enderman'/3846, l='MpServer', x=-82,50, y=32,00, z=56,50], yo['Enderman'/3850, l='MpServer', x=-6,50, y=61,00, z=47,50], yo['Enderman'/3851, l='MpServer', x=-6,56, y=61,00, z=43,81], yo['Enderman'/3854, l='MpServer', x=-50,50, y=63,00, z=-15,50], yo['Enderman'/3855, l='MpServer', x=-52,50, y=63,00, z=-15,50], yo['Enderman'/3856, l='MpServer', x=-53,50, y=63,00, z=-13,50], yo['Enderman'/3731, l='MpServer', x=-128,53, y=45,00, z=25,82], yo['Enderman'/3732, l='MpServer', x=-129,47, y=46,00, z=35,75], yo['Enderman'/3733, l='MpServer', x=-22,50, y=60,00, z=72,50], yo['Enderman'/3862, l='MpServer', x=-43,50, y=58,00, z=110,50], yo['Enderman'/3863, l='MpServer', x=-41,50, y=58,00, z=113,50], yo['Enderman'/3864, l='MpServer', x=-39,50, y=58,00, z=116,50], yo['Enderman'/3865, l='MpServer', x=-37,50, y=58,00, z=116,50], yo['Enderman'/3873, l='MpServer', x=-56,50, y=60,00, z=26,50], yo['Enderman'/3874, l='MpServer', x=-55,84, y=61,00, z=20,47], yo['Enderman'/3875, l='MpServer', x=-53,50, y=60,00, z=25,50], yo['Enderman'/3876, l='MpServer', x=-60,13, y=60,00, z=22,56], yo['Enderman'/3877, l='MpServer', x=-66,50, y=58,00, z=34,50], yo['Enderman'/3878, l='MpServer', x=-66,50, y=58,00, z=31,50], yo['Enderman'/3751, l='MpServer', x=-31,50, y=58,00, z=108,50], yo['Enderman'/3752, l='MpServer', x=-31,50, y=58,00, z=108,50], yo['Enderman'/3753, l='MpServer', x=-25,50, y=58,00, z=98,50], yo['Enderman'/3754, l='MpServer', x=-28,50, y=58,00, z=97,50], yo['Enderman'/3759, l='MpServer', x=-26,50, y=59,00, z=64,50], yo['Enderman'/3760, l='MpServer', x=-24,50, y=59,00, z=61,50], yo['Enderman'/3761, l='MpServer', x=-25,50, y=59,00, z=64,50], yo['Enderman'/3762, l='MpServer', x=-31,31, y=59,00, z=71,41], bmg['URoulon'/161, l='MpServer', x=-82,88, y=21,06, z=64,44], yo['Enderman'/3767, l='MpServer', x=-102,25, y=31,00, z=32,47], yo['Enderman'/3768, l='MpServer', x=-98,56, y=30,00, z=37,28], yo['Enderman'/3769, l='MpServer', x=-93,50, y=29,00, z=34,50], yo['Enderman'/3770, l='MpServer', x=-100,19, y=29,00, z=29,44], yo['Enderman'/3779, l='MpServer', x=-38,50, y=60,00, z=42,50], yo['Enderman'/3780, l='MpServer', x=-35,50, y=60,00, z=43,50], yo['Enderman'/3781, l='MpServer', x=-35,50, y=60,00, z=39,50], yo['Enderman'/3782, l='MpServer', x=-38,50, y=60,00, z=37,50], yo['Enderman'/3787, l='MpServer', x=-67,50, y=26,00, z=22,50], yo['Enderman'/3667, l='MpServer', x=-46,34, y=61,00, z=22,38], yo['Enderman'/3668, l='MpServer', x=-36,50, y=59,00, z=10,78], yo['Enderman'/3809, l='MpServer', x=-11,78, y=61,00, z=11,28], yo['Enderman'/3810, l='MpServer', x=-10,50, y=60,00, z=-0,31], yo['Enderman'/3691, l='MpServer', x=-19,50, y=61,00, z=6,50], yo['Enderman'/3692, l='MpServer', x=-20,50, y=61,00, z=7,50], yo['Enderman'/3828, l='MpServer', x=-76,50, y=51,00, z=50,50], yo['Enderman'/3829, l='MpServer', x=-80,50, y=51,00, z=51,50], yo['Enderman'/3703, l='MpServer', x=-27,50, y=58,00, z=92,50], yo['Enderman'/3704, l='MpServer', x=-26,50, y=58,00, z=90,50], yo['Enderman'/3705, l='MpServer', x=-24,50, y=58,00, z=90,50], yo['Enderman'/3706, l='MpServer', x=-29,50, y=58,00, z=93,50], yo['Enderman'/3837, l='MpServer', x=-58,50, y=57,00, z=94,50], yo['Enderman'/3838, l='MpServer', x=-59,50, y=57,00, z=93,50], yo['Enderman'/3839, l='MpServer', x=-57,50, y=57,00, z=94,50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bkh.a(SourceFile:364)
at bbz.b(SourceFile:2496)
at bbz.a(SourceFile:400)
at net.minecraft.client.main.Main.main(SourceFile:122)

– System Details –
Details:
Minecraft Version: 15w49a
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 821135240 bytes (783 MB) / 1643577344 bytes (1567 MB) up to 4187619328 bytes (3993 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn1G
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Launched Version: 15w49a
LWJGL: 2.9.4
OpenGL: AMD Radeon HD 7800 Series GL version 4.5.13416 Compatibility Profile Context 15.300.1025.0, 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: Yes
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)
CPU: 8x AMD FX(tm)-8350 Eight-Core Processor