I placed an Ender Dragon head in Creative. After a bit of toying with the upcoming 1.9 things, I decided to break the Ender Dragon head which I placed. When I broke it, my Minecraft lost all of it's blocks and the GUI's dissapeared, then my Minecraft crashed a second later. Here is the Crash Report:
---- Minecraft Crash Report ----
// Why is it breaking

Time: 8/14/15 4:30 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: 10191
Entity Name: ~_ERROR~ NullPointerException: null
Entity's Exact location: 12.45, 70.68, -15.27
Entity's Block location: 12.00,70.00,-16.00 - World: (12,70,-16), Chunk: (at 12,4,0 in 0,-1; contains blocks 0,0,-16 to 15,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Entity's Momentum: -0.05, 0.11, 0.08
Entity's Rider: ~_ERROR~ NullPointerException: null
Entity's Vehicle: ~_ERROR~ NullPointerException: null

– Renderer details –
Details:
Assigned renderer: bny@d2f9ea
Location: 0.46,-0.02,0.44 - World: (0,-1,0), Chunk: (at 0,-1,0 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)
Rotation: 101.25
Delta: 0.32917476
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['SkyMinecraftFan'/225, l='MpServer', x=12.02, y=70.52, z=-15.76]]
Chunk stats: MultiplayerChunkCache: 441, 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: 0.00,64.00,0.00 - World: (0,64,0), Chunk: (at 0,4,0 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: 48734 game time, 33574 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: ~_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 7 (x86) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 64957016 bytes (61 MB) / 436178944 bytes (415 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: GeForce GT 430/PCIe/SSE2/3DNOW! GL version 4.5.0 NVIDIA 353.62, NVIDIA Corporation
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 AMD Phenom(tm) 9850 Quad-Core Processor

I hope this can be fixed, as I can realize it is severely major.