Right clicking with a Shield in the off hand and a Enderpearl in the on hand. When you try to close the Game he crasht.
The crash report:
---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 21.08.15 17:23
Description: Updating screen events

com.google.common.util.concurrent.ExecutionError: java.lang.OutOfMemoryError: Java heap space
at com.google.common.util.concurrent.Futures.wrapAndThrowUnchecked(Futures.java:1430)
at com.google.common.util.concurrent.Futures.getUnchecked(Futures.java:1423)
at bux.w(SourceFile:330)
at azi.a(SourceFile:1967)
at azi.a(SourceFile:1955)
at bbu.a(SourceFile:50)
at bby.a(SourceFile:340)
at bby.k(SourceFile:403)
at bby.p(SourceFile:380)
at azi.s(SourceFile:1485)
at azi.av(SourceFile:879)
at azi.a(SourceFile:328)
at net.minecraft.client.main.Main.main(SourceFile:125)
Caused by: java.lang.OutOfMemoryError: Java heap space
at io.netty.buffer.PoolArena$HeapArena.newChunk(PoolArena.java:391)
at io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:179)
at io.netty.buffer.PoolArena.allocate(PoolArena.java:168)
at io.netty.buffer.PoolArena.allocate(PoolArena.java:98)
at io.netty.buffer.PooledByteBufAllocator.newHeapBuffer(PooledByteBufAllocator.java:235)
at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:136)
at gq.a(SourceFile:45)
at gp.<init>(SourceFile:30)
at li$a.b(SourceFile:64)
at li.c(SourceFile:351)
at me.e(SourceFile:309)
at bux$3.run(SourceFile:335)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at g.a(SourceFile:45)
at bux.C(SourceFile:148)
at net.minecraft.server.MinecraftServer.run(SourceFile:457)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Stacktrace:
at com.google.common.util.concurrent.Futures.wrapAndThrowUnchecked(Futures.java:1430)
at com.google.common.util.concurrent.Futures.getUnchecked(Futures.java:1423)
at bux.w(SourceFile:330)
at azi.a(SourceFile:1967)
at azi.a(SourceFile:1955)
at bbu.a(SourceFile:50)
at bby.a(SourceFile:340)
at bby.k(SourceFile:403)
at bby.p(SourceFile:380)

– Affected screen –
Details:
Screen name: bbu

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bjn['HeroFruit'/998, l='MpServer', x=96,49, y=63,00, z=-18,97]]
Chunk stats: MultiplayerChunkCache: 607, 607
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: 232,00,64,00,-40,00 - World: (232,64,-40), Chunk: (at 8,4,8 in 14,-3; contains blocks 224,0,-48 to 239,255,-33), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 66165 game time, 36406 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: 42 total; [xu['Creeper'/1796, l='MpServer', x=168,50, y=14,00, z=-44,50], yh['Skeleton'/2958, l='MpServer', x=157,50, y=51,00, z=-85,50], yh['Skeleton'/1809, l='MpServer', x=150,50, y=16,00, z=-12,50], yl['Zombie'/788, l='MpServer', x=89,50, y=29,00, z=-98,50], yl['Zombie'/789, l='MpServer', x=87,59, y=29,00, z=-92,88], yh['Skeleton'/2465, l='MpServer', x=117,50, y=48,00, z=22,50], xu['Creeper'/2850, l='MpServer', x=151,50, y=54,00, z=-85,50], xu['Creeper'/2851, l='MpServer', x=152,50, y=54,00, z=-85,50], va['Bat'/812, l='MpServer', x=150,47, y=12,66, z=-10,86], va['Bat'/813, l='MpServer', x=150,52, y=13,97, z=-10,54], yl['Zombie'/2736, l='MpServer', x=111,50, y=44,00, z=10,50], xu['Creeper'/2737, l='MpServer', x=104,50, y=44,00, z=22,50], va['Bat'/829, l='MpServer', x=159,84, y=55,04, z=-83,53], va['Bat'/830, l='MpServer', x=162,60, y=54,97, z=-88,52], xu['Creeper'/833, l='MpServer', x=166,44, y=13,00, z=-75,56], xu['Creeper'/834, l='MpServer', x=168,51, y=11,00, z=-65,82], yh['Skeleton'/2498, l='MpServer', x=168,50, y=62,00, z=-68,50], yj['Spider'/835, l='MpServer', x=165,16, y=13,00, z=-75,19], yh['Skeleton'/836, l='MpServer', x=167,69, y=12,00, z=-68,41], yh['Skeleton'/2500, l='MpServer', x=117,50, y=42,00, z=-2,50], yh['Skeleton'/837, l='MpServer', x=168,53, y=15,00, z=-80,06], xu['Creeper'/1605, l='MpServer', x=154,50, y=15,00, z=-3,50], xu['Creeper'/1606, l='MpServer', x=152,50, y=15,00, z=-2,50], xu['Creeper'/2249, l='MpServer', x=114,50, y=22,00, z=37,50], xu['Creeper'/2250, l='MpServer', x=115,50, y=22,00, z=38,50], xu['Creeper'/2251, l='MpServer', x=116,50, y=22,00, z=36,50], yh['Skeleton'/2642, l='MpServer', x=141,50, y=32,00, z=36,50], yl['Zombie'/1363, l='MpServer', x=73,47, y=46,00, z=8,94], xu['Creeper'/1366, l='MpServer', x=71,50, y=45,00, z=14,50], yl['Zombie'/2393, l='MpServer', x=102,50, y=27,00, z=28,50], yl['Zombie'/2394, l='MpServer', x=100,50, y=27,00, z=26,50], va['Bat'/2654, l='MpServer', x=87,52, y=43,97, z=16,59], yh['Skeleton'/2143, l='MpServer', x=170,50, y=26,00, z=-3,50], va['Bat'/2655, l='MpServer', x=93,67, y=43,16, z=18,35], xu['Creeper'/1389, l='MpServer', x=155,50, y=14,00, z=-2,50], bjn['HeroFruit'/998, l='MpServer', x=96,49, y=63,00, z=-18,97], yh['Skeleton'/2927, l='MpServer', x=63,50, y=65,00, z=13,50], yh['Skeleton'/2928, l='MpServer', x=63,50, y=65,00, z=9,50], yh['Skeleton'/2929, l='MpServer', x=65,50, y=65,00, z=7,50], yl['Zombie'/2931, l='MpServer', x=60,50, y=65,00, z=10,50], xu['Creeper'/1269, l='MpServer', x=90,50, y=30,00, z=5,50], yh['Skeleton'/2807, l='MpServer', x=115,50, y=22,00, z=36,50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bho.a(SourceFile:359)
at azi.b(SourceFile:2312)
at azi.a(SourceFile:337)
at net.minecraft.client.main.Main.main(SourceFile:125)

– System Details –
Details:
Minecraft Version: 15w34c
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 17946824 bytes (17 MB) / 523501568 bytes (499 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: 13, tallocated: 95
Launched Version: 15w34c
LWJGL: 2.9.4
OpenGL: GeForce GT 545/PCIe/SSE2 GL version 4.5.0 NVIDIA 355.60, 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 (UK)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i5-2310 CPU @ 2.90GHz