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I get this crash when trying to login into a server

---- Minecraft Crash Report ----
// I just don't know what went wrong

Time: 11/11/13 6:41 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at abp.a(SourceFile:331)
at xj.k(SourceFile:203)
at xl.e(SourceFile:430)
at blc.e(SourceFile:205)
at rh.h(SourceFile:1205)
at xl.h(SourceFile:240)
at bje.h(SourceFile:63)
at afn.a(SourceFile:1368)
at afn.g(SourceFile:1346)
at afn.h(SourceFile:1253)
at azd.o(SourceFile:1532)
at azd.ad(SourceFile:753)
at azd.e(SourceFile:704)
at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
at abp.a(SourceFile:331)
at xj.k(SourceFile:203)
at xl.e(SourceFile:430)
at blc.e(SourceFile:205)
at rh.h(SourceFile:1205)
at xl.h(SourceFile:240)
at bje.h(SourceFile:63)
at afn.a(SourceFile:1368)
at afn.g(SourceFile:1346)

-- Entity being ticked --
Details:
Entity Type: null (bje)
Entity ID: 7132181
Entity Name: Horsea1
Entity's Exact location: 1918.50, 83.62, -610.50
Entity's Block location: World: (1918,83,-611), Chunk: (at 14,5,13 in 119,-39; contains blocks 1904,0,-624 to 1919,255,-609), Region: (3,-2; contains chunks 96,-64 to 127,-33, blocks 1536,0,-1024 to 2047,255,-513)
Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
at afn.h(SourceFile:1253)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bje['Horsea1'/7132181, l='MpServer', x=1918.50, y=83.62, z=-610.50]]
Chunk stats: MultiplayerChunkCache: 441, 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (1918,82,-611), Chunk: (at 14,5,13 in 119,-39; contains blocks 1904,0,-624 to 1919,255,-609), Region: (3,-2; contains chunks 96,-64 to 127,-33, blocks 1536,0,-1024 to 2047,255,-513)
Level time: 80652334 game time, 78477225 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: 30 total; [bje['Horsea1'/7132181, l='MpServer', x=1918.50, y=83.62, z=-610.50], uq['Bat'/7132192, l='MpServer', x=1889.75, y=47.43, z=-640.81], wl['Creeper'/7132193, l='MpServer', x=1923.59, y=31.00, z=-635.91], uq['Bat'/7132194, l='MpServer', x=1873.53, y=47.37, z=-622.34], wx['Skeleton'/7132195, l='MpServer', x=1950.59, y=39.00, z=-614.69], xc['Zombie'/7132196, l='MpServer', x=1904.09, y=24.00, z=-583.44], xc['Zombie'/7132197, l='MpServer', x=1899.31, y=24.00, z=-582.53], wl['Creeper'/7132198, l='MpServer', x=1902.50, y=24.00, z=-580.50], xc['Zombie'/7132199, l='MpServer', x=1900.22, y=24.00, z=-582.53], wx['Skeleton'/7132200, l='MpServer', x=1881.50, y=24.00, z=-629.50], wm['Enderman'/7132201, l='MpServer', x=1940.50, y=26.00, z=-637.50], wl['Creeper'/7132202, l='MpServer', x=1941.50, y=19.00, z=-630.50], wz['Spider'/7132203, l='MpServer', x=1942.72, y=51.00, z=-602.00], wx['Skeleton'/7132204, l='MpServer', x=1922.87, y=44.00, z=-577.80], wl['Creeper'/7132205, l='MpServer', x=1928.00, y=57.00, z=-588.41], uq['Bat'/7132206, l='MpServer', x=1885.47, y=22.55, z=-590.28], xc['Zombie'/7132207, l='MpServer', x=1940.50, y=19.00, z=-649.50], wm['Enderman'/7132209, l='MpServer', x=1963.75, y=38.00, z=-609.91], xc['Zombie'/7132208, l='MpServer', x=1941.50, y=19.00, z=-650.50], wl['Creeper'/7132210, l='MpServer', x=1925.50, y=50.00, z=-575.50], uq['Bat'/7132183, l='MpServer', x=1912.13, y=26.10, z=-619.50], xc['Zombie'/7132182, l='MpServer', x=1905.44, y=17.00, z=-615.72], wl['Creeper'/7132187, l='MpServer', x=1919.88, y=32.00, z=-629.78], uq['Bat'/7132186, l='MpServer', x=1916.91, y=16.55, z=-620.59], uq['Bat'/7132185, l='MpServer', x=1905.13, y=25.49, z=-615.44], wl['Creeper'/7132184, l='MpServer', x=1916.59, y=33.00, z=-624.00], wl['Creeper'/7132191, l='MpServer', x=1901.41, y=45.00, z=-595.00], wl['Creeper'/7132190, l='MpServer', x=1931.75, y=36.00, z=-621.25], uq['Bat'/7132189, l='MpServer', x=1932.88, y=34.00, z=-617.66], uq['Bat'/7132188, l='MpServer', x=1935.75, y=27.10, z=-614.25]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at biz.a(SourceFile:284)
at azd.b(SourceFile:1951)
at azd.e(SourceFile:713)
at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 20812968 bytes (19 MB) / 82849792 bytes (79 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 3239 (181384 bytes; 0 MB) allocated, 5 (280 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.2
LWJGL: 2.9.0
OpenGL: AMD Radeon HD 5450 GL version 4.2.12430 Compatibility Profile Context 13.152.1.8000, ATI Technologies Inc.
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)
Vec3 Pool Size: 690 (38640 bytes; 0 MB) allocated, 19 (1064 bytes; 0 MB) used
Anisotropic Filtering: Off (1)