Horses with chest crashes the game when items are put in them.
The command is like spawning a donkey with all the aspects without the "{Type:1," part.

(Crash Report Untouched)
---- Minecraft Crash Report ----
// My bad.

Time: 4/17/15 4:47 PM
Description: Updating screen events

java.lang.ArrayIndexOutOfBoundsException: 3
at oq.a(SourceFile:115)
at yg.d(SourceFile:81)
at xi.a(SourceFile:239)
at bda.a(SourceFile:368)
at ayl.a(SourceFile:515)
at ayl.b(SourceFile:486)
at axu.k(SourceFile:419)
at axu.p(SourceFile:390)
at ave.s(SourceFile:1497)
at ave.av(SourceFile:888)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)

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

– Head –
Stacktrace:
at oq.a(SourceFile:115)
at yg.d(SourceFile:81)
at xi.a(SourceFile:239)
at bda.a(SourceFile:368)
at ayl.a(SourceFile:515)
at ayl.b(SourceFile:486)
at axu.k(SourceFile:419)
at axu.p(SourceFile:390)

– Affected screen –
Details:
Screen name: azb

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bew['MinerMan1963'/860, l='MpServer', x=96.06, y=56.85, z=703.19]]
Chunk stats: MultiplayerChunkCache: 289, 289
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: 100.00,4.00,701.00 - World: (100,4,701), Chunk: (at 4,0,13 in 6,43; contains blocks 96,0,688 to 111,255,703), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
Level time: 389043 game time, 13000 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: 9 total; [bew['MinerMan1963'/860, l='MpServer', x=90.50, y=56.00, z=693.50], bew['MinerMan1963'/860, l='MpServer', x=105.50, y=56.00, z=710.50], tp['Horse'/1480845, l='MpServer', x=96.06, y=56.00, z=703.19], bew['MinerMan1963'/860, l='MpServer', x=96.06, y=56.85, z=703.19], bew['MinerMan1963'/860, l='MpServer', x=93.31, y=56.00, z=706.79], bew['MinerMan1963'/860, l='MpServer', x=109.50, y=56.00, z=691.50], bew['MinerMan1963'/860, l='MpServer', x=471.43, y=56.00, z=508.64], bew['MinerMan1963'/860, l='MpServer', x=97.50, y=56.00, z=693.50], bew['MinerMan1963'/860, l='MpServer', x=96.50, y=56.00, z=703.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bdb.a(SourceFile:309)
at ave.b(SourceFile:2296)
at ave.a(SourceFile:334)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.8.4
Operating System: Windows 8.1 (amd64) version 6.3
CPU: 4x AMD A4-5000 APU with Radeon(TM) HD Graphics
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 227184880 bytes (216 MB) / 426475520 bytes (406 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: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8.4
LWJGL: 2.9.4
OpenGL: AMD Radeon HD 8330 GL version 4.2.12422 Compatibility Profile Context 13.152.1.3000, 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: [§lDefault 3D§r Lite §lV3.0.0.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)