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Whenever i play on mineplex, after a few minutes i crash when the minigame starts (any of them) and sends me back to the launcher with this message:

---- Minecraft Crash Report ----
// Oops.

Time: 3/19/16 10:24 PM
Description: Batching chunks

java.lang.NullPointerException: Batching chunks
at bqb.a(SourceFile:172)
at bqb.a(SourceFile:72)
at bqb.run(SourceFile:42)
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 --
Stacktrace:
at bku.a(WorldClient.java:453)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bmt['Azact'/2405261, l='MpServer', x=3.48, y=104.00, z=3.55]]
Chunk stats: MultiplayerChunkCache: 1, 1
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (1363,4,-458), Chunk: (at 3,0,6 in 85,-29; contains blocks 1360,0,-464 to 1375,255,-449), Region: (2,-1; contains chunks 64,-32 to 95,-1, blocks 1024,0,-512 to 1535,255,-1)
Level time: 445771 game time, 306390000 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: 24 total; [bmt['Azact'/2405261, l='MpServer', x=3.48, y=104.00, z=3.55], bmu['PION01'/248497, l='MpServer', x=2.75, y=104.00, z=1.25], bmu['HotSevereGnat'/248496, l='MpServer', x=3.81, y=104.00, z=2.34], bmu['HipYaYip'/237703, l='MpServer', x=-1.31, y=104.00, z=2.63], bmu['HipYaYip'/237703, l='MpServer', x=-1.31, y=104.00, z=2.63], bmu['drgamer555'/236645, l='MpServer', x=-2.59, y=104.00, z=2.91], bmu['jigglypuff_2'/249286, l='MpServer', x=2.72, y=104.00, z=-2.00], bmu['jigglypuff_2'/249286, l='MpServer', x=2.72, y=104.00, z=-2.00], bmu['drgamer555'/236645, l='MpServer', x=-2.59, y=104.00, z=2.91], bmu['ProfessorHotbuns'/236644, l='MpServer', x=2.97, y=104.00, z=-4.00], xq['§7No Rewards'/230533, l='MpServer', x=3.50, y=102.06, z=-3.44], bmu['ProfessorHotbuns'/236644, l='MpServer', x=2.97, y=104.00, z=-4.00], bmu['Spiderman060601'/248495, l='MpServer', x=3.44, y=104.00, z=-3.16], bmu['Katgirl94'/200331, l='MpServer', x=-3.00, y=104.00, z=1.25], bmu['Katgirl94'/200331, l='MpServer', x=-3.00, y=104.00, z=1.25], bmu['CaptainAmerica'/236653, l='MpServer', x=2.91, y=104.00, z=2.59], bmu['Spiderman060601'/248495, l='MpServer', x=3.44, y=104.00, z=-3.16], bmu['EllBeeEmm'/229212, l='MpServer', x=2.94, y=104.00, z=1.09], bmu['CaptainAmerica'/236653, l='MpServer', x=2.91, y=104.00, z=2.59], bmu['PION01'/248497, l='MpServer', x=2.75, y=104.00, z=1.25], bmu['HotSevereGnat'/248496, l='MpServer', x=3.81, y=104.00, z=2.34], yw['§eBuilder Kit'/248376, l='MpServer', x=-17.00, y=102.50, z=0.00], xq['§eBuilder Kit'/256541, l='MpServer', x=31250.00, y=0.00, z=0.00], bmu['EllBeeEmm'/229212, l='MpServer', x=2.94, y=104.00, z=1.09]]
Retry entities: 1 total; [xq['§eBuilder Kit'/256541, l='MpServer', x=31250.00, y=0.00, z=0.00]]
Server brand: BungeeCord (git:BungeeCord-Bootstrap:1.9-SNAPSHOT:46e7f2d:1126) <- Mineplex Spigot
Server type: Non-integrated multiplayer server
Stacktrace:
at bku.a(WorldClient.java:453)
at bcf.b(SourceFile:2515)
at bqb.run(SourceFile:48)
at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
Minecraft Version: 1.9
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 235613288 bytes (224 MB) / 357408768 bytes (340 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: 1.9-OptiFine_HD_U_A0_pre
LWJGL: 2.9.4
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 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: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 2x Intel(R) Celeron(R) CPU B830 @ 1.80GHz
OptiFine Version: OptiFine_1.9_HD_U_A0_pre
Render Distance Chunks: 8
Mipmaps: 0
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 3.1.0 - Build 9.17.10.4229
OpenGlRenderer: Intel(R) HD Graphics
OpenGlVendor: Intel
CpuCount: 2

Also, where it says that my client is modded, the only 'mod' I have is optifine, if that is considered one.

Quote from majestyc2k1»

Try removing Optifine, since its like in "alpha" state.