hypixal game crash on walls

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 9/26/16 5:59 PM
Description: Batching chunks

java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at aid.a(SourceFile:1868)
	at asv.a(SourceFile:636)
	at aim.a(SourceFile:68)
	at aim.r(SourceFile:60)
	at ChunkCacheOF.r(ChunkCacheOF.java:184)
	at bqy.b(RenderChunk.java:209)
	at bqu.a(ChunkRenderWorker.java:119)
	at bqu.run(ChunkRenderWorker.java:47)
	at java.lang.Thread.run(Thread.java:745)


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

-- Head --
Thread: Client thread
Stacktrace:
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at aid.a(SourceFile:1868)
	at asv.a(SourceFile:636)
	at aim.a(SourceFile:68)
	at aim.r(SourceFile:60)
	at ChunkCacheOF.r(ChunkCacheOF.java:184)

-- Affected level --
Details:
	Level name: MpServer
	All players: 9 total; [bnn['RealAmeer'/8771, l='MpServer', x=-681.82, y=124.00, z=-169.90], bno['JAMESvsBRICK'/112, l='MpServer', x=-682.34, y=124.00, z=-171.38], bno['Bella_Baker'/129, l='MpServer', x=-674.78, y=124.50, z=-176.38], bno['Fightclubtb'/130, l='MpServer', x=-680.63, y=125.14, z=-169.83], bno['Catlady23'/115, l='MpServer', x=-680.00, y=124.00, z=-172.00], bno['SuperScourge'/117, l='MpServer', x=-680.00, y=124.00, z=-172.00], bno['Dwight_destroyer'/125, l='MpServer', x=-683.72, y=124.00, z=-172.63], bno['blondefreak12'/114, l='MpServer', x=-682.78, y=124.00, z=-177.13], bno['DammitSharon'/132, l='MpServer', x=-680.00, y=124.07, z=-171.52]]
	Chunk stats: MultiplayerChunkCache: 441, 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options:
	Level spawn location: World: (-794,92,-173), Chunk: (at 6,5,3 in -50,-11; contains blocks -800,0,-176 to -785,255,-161), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)
	Level time: 3345447 game time, 24000 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: 17 total; [bno['Bella_Baker'/129, l='MpServer', x=-674.78, y=124.50, z=-176.38], bno['Fightclubtb'/130, l='MpServer', x=-680.63, y=125.14, z=-169.83], bno['DammitSharon'/132, l='MpServer', x=-680.00, y=124.07, z=-171.52], bno['JAMESvsBRICK'/112, l='MpServer', x=-682.34, y=124.00, z=-171.38], bno['blondefreak12'/114, l='MpServer', x=-682.78, y=124.00, z=-177.13], bno['Catlady23'/115, l='MpServer', x=-680.00, y=124.00, z=-172.00], bnn['RealAmeer'/8771, l='MpServer', x=-681.85, y=124.00, z=-170.18], bno['SuperScourge'/117, l='MpServer', x=-680.00, y=124.00, z=-172.00], bno['JAMESvsBRICK'/112, l='MpServer', x=-682.34, y=124.00, z=-171.38], bno['Bella_Baker'/129, l='MpServer', x=-674.78, y=124.50, z=-176.38], bno['Fightclubtb'/130, l='MpServer', x=-680.63, y=125.14, z=-169.83], bno['Catlady23'/115, l='MpServer', x=-680.00, y=124.00, z=-172.00], bno['SuperScourge'/117, l='MpServer', x=-680.00, y=124.00, z=-172.00], bno['Dwight_destroyer'/125, l='MpServer', x=-683.72, y=124.00, z=-172.63], bno['blondefreak12'/114, l='MpServer', x=-682.78, y=124.00, z=-177.13], bno['Dwight_destroyer'/125, l='MpServer', x=-683.72, y=124.00, z=-172.63], bno['DammitSharon'/132, l='MpServer', x=-680.00, y=124.07, z=-171.52]]
	Retry entities: 0 total; []
	Server brand: BungeeCord (Hypixel) <- vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at bln.a(WorldClient.java:498)
	at bcx.b(SourceFile:2535)
	at bqu.run(ChunkRenderWorker.java:57)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.10.2
	Operating System: Mac OS X (x86_64) version 10.11.4
	Java Version: 1.8.0_74, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 173580832 bytes (165 MB) / 407130112 bytes (388 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.10.2-OptiFine_HD_U_C3
	LWJGL: 2.9.2
	OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object 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: Very likely; Jar signature invalidated
	Type: Client (map_client.txt)
	Resource Packs: Faithful 1.10.2-r4, CodeCrafted Custom , Connected Clear Glass 1.9 - 1.10 [x32]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 4x Intel(R) Core(TM) i5-4288U CPU @ 2.60GHz
	OptiFine Version: OptiFine_1.10.2_HD_U_C3
	Render Distance Chunks: 8
	Mipmaps: 4
	Anisotropic Filtering: 1
	Antialiasing: 0
	Multitexture: false
	Shaders: null
	OpenGlVersion: 2.1 INTEL-10.14.58
	OpenGlRenderer: Intel Iris OpenGL Engine
	OpenGlVendor: Intel Inc.
	CpuCount: 4