I crash putting on armor

What I expected to happen was...:
Armor is put on

What actually happened was...:
Mr. Armor got mad then crashed me

Steps to Reproduce:
Get a piece of chest plate
Put it on
Mr. Armor no likes you
ALL DETAILS:
---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 12/2/15 3:32 PM
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['Kevin_W_825'/305, l='MpServer', x=-466.10, y=63.90, z=385.69]]
Chunk stats: MultiplayerChunkCache: 2079, 2079
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-248,64,160), Chunk: (at 8,4,0 in -16,10; contains blocks -256,0,160 to -241,255,175), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 6834 game time, 6834 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: 116 total; [vq['Bat'/7423, l='MpServer', x=-446.25, y=27.00, z=402.75], vq['Bat'/5715, l='MpServer', x=-468.63, y=26.94, z=392.47], zb['Skeleton'/6310, l='MpServer', x=-538.50, y=51.00, z=438.50], vq['Bat'/5717, l='MpServer', x=-465.88, y=23.00, z=403.59], yn['Creeper'/6847, l='MpServer', x=-499.50, y=20.00, z=424.50], yn['Creeper'/7080, l='MpServer', x=-501.50, y=31.00, z=331.50], yn['Creeper'/7081, l='MpServer', x=-501.50, y=31.00, z=331.50], wc['Squid'/7097, l='MpServer', x=-490.02, y=54.59, z=330.91], vq['Bat'/6559, l='MpServer', x=-476.53, y=39.34, z=427.41], wc['Squid'/7096, l='MpServer', x=-485.57, y=51.33, z=334.78], wc['Squid'/7098, l='MpServer', x=-496.06, y=55.76, z=322.44], yn['Creeper'/6823, l='MpServer', x=-465.50, y=20.00, z=378.50], wc['Squid'/7095, l='MpServer', x=-492.16, y=51.62, z=323.70], wc['Squid'/7094, l='MpServer', x=-489.00, y=59.35, z=320.74], yn['Creeper'/6551, l='MpServer', x=-540.56, y=52.00, z=431.13], bmg['Kevin_W_825'/305, l='MpServer', x=-466.10, y=63.90, z=385.69], zd['Spider'/5910, l='MpServer', x=-475.50, y=31.00, z=371.50], zd['Spider'/5908, l='MpServer', x=-472.72, y=31.00, z=366.69], yn['Creeper'/6869, l='MpServer', x=-464.50, y=31.00, z=434.50], zb['Skeleton'/5906, l='MpServer', x=-475.00, y=31.00, z=369.69], zb['Skeleton'/5907, l='MpServer', x=-473.13, y=31.00, z=368.75], zb['Skeleton'/6384, l='MpServer', x=-538.50, y=51.00, z=438.50], wc['Squid'/7131, l='MpServer', x=-459.47, y=52.69, z=374.58], wc['Squid'/7130, l='MpServer', x=-454.32, y=50.66, z=373.08], wa['Sheep'/324, l='MpServer', x=-491.53, y=107.00, z=416.22], zb['Skeleton'/7135, l='MpServer', x=-453.50, y=25.00, z=402.50], wa['Sheep'/322, l='MpServer', x=-490.50, y=105.00, z=422.50], wa['Sheep'/323, l='MpServer', x=-489.50, y=105.00, z=423.50], yo['Enderman'/7134, l='MpServer', x=-458.50, y=15.00, z=392.50], wc['Squid'/7133, l='MpServer', x=-456.75, y=56.89, z=368.48], wc['Squid'/7132, l='MpServer', x=-452.87, y=52.84, z=382.20], wa['Sheep'/321, l='MpServer', x=-488.50, y=105.00, z=423.50], wa['Sheep'/1282, l='MpServer', x=-532.50, y=85.00, z=428.50], zf['Zombie'/6848, l='MpServer', x=-497.50, y=20.00, z=423.50], zd['Spider'/5895, l='MpServer', x=-475.50, y=31.00, z=371.50], vt['Chicken'/1283, l='MpServer', x=-529.72, y=86.00, z=428.72], wa['Sheep'/1280, l='MpServer', x=-528.31, y=86.00, z=426.28], zd['Spider'/5893, l='MpServer', x=-475.97, y=32.00, z=368.59], wa['Sheep'/1281, l='MpServer', x=-529.38, y=86.00, z=424.88], zb['Skeleton'/5892, l='MpServer', x=-475.72, y=31.00, z=366.28], vt['Chicken'/1286, l='MpServer', x=-535.31, y=84.00, z=432.47], zb['Skeleton'/5891, l='MpServer', x=-474.25, y=31.00, z=370.03], zf['Zombie'/6853, l='MpServer', x=-475.50, y=24.00, z=403.50], vt['Chicken'/1284, l='MpServer', x=-529.31, y=86.00, z=426.47], zf['Zombie'/6854, l='MpServer', x=-474.50, y=24.00, z=403.50], vt['Chicken'/1285, l='MpServer', x=-528.50, y=86.00, z=420.69], zf['Zombie'/6855, l='MpServer', x=-475.50, y=24.00, z=406.50], wc['Squid'/7144, l='MpServer', x=-457.89, y=49.48, z=416.59], vq['Bat'/7145, l='MpServer', x=-462.25, y=31.10, z=431.50], vq['Bat'/7146, l='MpServer', x=-460.38, y=29.50, z=423.13], yn['Creeper'/7147, l='MpServer', x=-453.16, y=39.00, z=420.34], yn['Creeper'/7148, l='MpServer', x=-453.63, y=39.00, z=420.56], yn['Creeper'/7149, l='MpServer', x=-455.50, y=40.00, z=420.50], vq['Bat'/7150, l='MpServer', x=-458.06, y=36.47, z=430.97], wc['Squid'/7151, l='MpServer', x=-450.40, y=49.41, z=415.77], vq['Bat'/7136, l='MpServer', x=-458.00, y=26.16, z=409.41], vq['Bat'/7137, l='MpServer', x=-465.50, y=25.06, z=408.81], zf['Zombie'/7138, l='MpServer', x=-452.50, y=30.00, z=402.50], zd['Spider'/7139, l='MpServer', x=-461.50, y=24.00, z=413.50], zb['Skeleton'/7140, l='MpServer', x=-453.50, y=24.00, z=406.50], zb['Skeleton'/7141, l='MpServer', x=-463.50, y=27.00, z=404.50], wc['Squid'/7142, l='MpServer', x=-459.27, y=47.31, z=410.24], vq['Bat'/6592, l='MpServer', x=-463.25, y=39.97, z=426.25], wc['Squid'/7143, l='MpServer', x=-461.60, y=48.47, z=408.38], wa['Sheep'/7153, l='MpServer', x=-457.50, y=136.00, z=462.50], zf['Zombie'/7152, l='MpServer', x=-461.44, y=27.00, z=429.16], vq['Bat'/6613, l='MpServer', x=-464.25, y=40.10, z=428.41], zf['Zombie'/7533, l='MpServer', x=-438.50, y=45.00, z=418.50], zb['Skeleton'/7532, l='MpServer', x=-437.50, y=45.00, z=420.50], yo['Enderman'/7531, l='MpServer', x=-434.50, y=45.00, z=416.50], zb['Skeleton'/7524, l='MpServer', x=-393.50, y=18.00, z=450.50], zb['Skeleton'/7523, l='MpServer', x=-393.50, y=18.00, z=449.50], yn['Creeper'/6452, l='MpServer', x=-541.81, y=52.00, z=429.38], yn['Creeper'/6453, l='MpServer', x=-540.97, y=52.00, z=430.41], zb['Skeleton'/6943, l='MpServer', x=-478.50, y=27.00, z=401.50], vq['Bat'/7266, l='MpServer', x=-505.28, y=17.69, z=429.50], zb['Skeleton'/7500, l='MpServer', x=-393.50, y=18.00, z=450.50], zb['Skeleton'/7499, l='MpServer', x=-393.50, y=18.00, z=449.50], zb['Skeleton'/5862, l='MpServer', x=-473.97, y=31.00, z=367.91], zd['Spider'/5863, l='MpServer', x=-470.59, y=31.00, z=376.94], zb['Skeleton'/5861, l='MpServer', x=-473.75, y=31.00, z=369.41], zd['Spider'/5865, l='MpServer', x=-475.50, y=31.00, z=371.50], vq['Bat'/7489, l='MpServer', x=-396.63, y=19.50, z=451.75], zb['Skeleton'/6412, l='MpServer', x=-538.50, y=51.00, z=438.50], zb['Skeleton'/7512, l='MpServer', x=-393.50, y=18.00, z=449.50], zb['Skeleton'/7513, l='MpServer', x=-393.50, y=18.00, z=450.50], wa['Sheep'/1279, l='MpServer', x=-527.53, y=89.00, z=432.75], vq['Bat'/7483, l='MpServer', x=-459.09, y=37.19, z=427.75], vq['Bat'/6513, l='MpServer', x=-463.25, y=40.10, z=426.25], zb['Skeleton'/6252, l='MpServer', x=-470.53, y=31.00, z=381.69], zb['Skeleton'/6251, l='MpServer', x=-469.66, y=31.00, z=381.69], zb['Skeleton'/6250, l='MpServer', x=-467.50, y=31.00, z=381.50], zb['Skeleton'/6771, l='MpServer', x=-474.59, y=31.00, z=368.78], zd['Spider'/6775, l='MpServer', x=-475.50, y=31.00, z=371.50], zb['Skeleton'/6772, l='MpServer', x=-473.78, y=31.00, z=367.25], wc['Squid'/7199, l='MpServer', x=-420.82, y=57.11, z=376.04], zd['Spider'/6773, l='MpServer', x=-475.00, y=31.00, z=367.69], zb['Skeleton'/6236, l='MpServer', x=-467.50, y=31.00, z=381.50], wc['Squid'/7185, l='MpServer', x=-428.41, y=56.77, z=341.39], zb['Skeleton'/6237, l='MpServer', x=-470.72, y=31.00, z=380.78], yn['Creeper'/6477, l='MpServer', x=-541.44, y=52.00, z=428.47], wc['Squid'/7186, l='MpServer', x=-429.92, y=54.53, z=347.81], zb['Skeleton'/6238, l='MpServer', x=-474.44, y=31.00, z=371.72], yn['Creeper'/6476, l='MpServer', x=-540.63, y=52.00, z=428.59], wc['Squid'/7187, l='MpServer', x=-432.15, y=62.09, z=336.43], vq['Bat'/7424, l='MpServer', x=-457.59, y=25.03, z=407.31], yn['Creeper'/6475, l='MpServer', x=-541.63, y=52.00, z=430.69], wc['Squid'/7188, l='MpServer', x=-418.85, y=53.65, z=385.31], yn['Creeper'/6232, l='MpServer', x=-510.50, y=15.00, z=430.50], wc['Squid'/7190, l='MpServer', x=-419.44, y=52.19, z=380.68], wc['Squid'/7191, l='MpServer', x=-425.64, y=49.11, z=387.53], wc['Squid'/7169, l='MpServer', x=-441.29, y=57.57, z=345.64], zb['Skeleton'/7171, l='MpServer', x=-439.63, y=15.00, z=397.47], zb['Skeleton'/7170, l='MpServer', x=-441.69, y=14.00, z=398.69], zb['Skeleton'/7173, l='MpServer', x=-439.19, y=17.00, z=398.34], yn['Creeper'/7175, l='MpServer', x=-438.50, y=33.00, z=409.50]]
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 8.1 (amd64) version 6.3
Java Version: 1.7.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 241044472 bytes (229 MB) / 678240256 bytes (646 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
Launched Version: 15w49a
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics GL version 4.0.0 - Build 10.18.10.3412, 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: 2x Intel(R) Pentium(R) CPU 2117U @ 1.80GHz