wither skull crash

Minecraft Crash Report ----
// Ooh. Shiny.

Time: 8/17/15 3:43 PM
Description: Rendering entity in world

java.lang.NullPointerException: Rendering entity in world
at acj.j(SourceFile:229)
at bjq.b(SourceFile:50)
at bjq.a(SourceFile:35)
at boa.a(SourceFile:212)
at bny.a(SourceFile:109)
at bny.a(SourceFile:19)
at bnn.a(SourceFile:302)
at bnn.a(SourceFile:267)
at bnn.a(SourceFile:234)
at bjt.a(SourceFile:605)
at bjm.a(SourceFile:1253)
at bjm.b(SourceFile:1158)
at bjm.a(SourceFile:1005)
at ayy.au(SourceFile:905)
at ayy.a(SourceFile:328)
at net.minecraft.client.main.Main.main(SourceFile:125)

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

– Head –
Stacktrace:
at acj.j(SourceFile:229)
at bjq.b(SourceFile:50)
at bjq.a(SourceFile:35)
at boa.a(SourceFile:212)
at bny.a(SourceFile:109)
at bny.a(SourceFile:19)

– Entity being rendered –
Details:
Entity Type: Item (xc)
Entity ID: 6910
Entity Name: ~_ERROR~ NullPointerException: null
Entity's Exact location: 1916.64, 66.37, 1012.28
Entity's Block location: 1916.00,66.00,1012.00 - World: (1916,66,1012), Chunk: (at 12,4,4 in 119,63; contains blocks 1904,0,1008 to 1919,255,1023), Region: (3,1; contains chunks 96,32 to 127,63, blocks 1536,0,512 to 2047,255,1023)
Entity's Momentum: 0.07, 0.11, 0.03
Entity's Rider: ~_ERROR~ NullPointerException: null
Entity's Vehicle: ~_ERROR~ NullPointerException: null

– Renderer details –
Details:
Assigned renderer: bny@428a1d
Location: -1.93,0.34,1.94 - World: (-2,0,1), Chunk: (at 14,0,1 in -1,0; contains blocks -16,0,0 to -1,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Rotation: 111.09375
Delta: 0.7769424
Stacktrace:
at bnn.a(SourceFile:302)
at bnn.a(SourceFile:267)
at bnn.a(SourceFile:234)
at bjt.a(SourceFile:605)
at bjm.a(SourceFile:1253)
at bjm.b(SourceFile:1158)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [biz['geodude1234'/52, l='MpServer', x=1918.55, y=66.00, z=1010.34]]
Chunk stats: MultiplayerChunkCache: 440, 440
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: 18.00,64.00,50.00 - World: (18,64,50), Chunk: (at 2,4,2 in 1,3; contains blocks 16,0,48 to 31,255,63), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 342826 game time, 1785 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~ NullPointerException: null
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bhb.a(SourceFile:314)
at ayy.b(SourceFile:2297)
at ayy.a(SourceFile:337)
at net.minecraft.client.main.Main.main(SourceFile:125)

– System Details –
Details:
Minecraft Version: 15w33c
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 241355384 bytes (230 MB) / 456445952 bytes (435 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: 12, tallocated: 94
Launched Version: 15w33c
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4400 GL version 4.2.0 - Build 10.18.10.3496, Intel
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)
CPU: 4x Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz