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Ahhh, I can't play on my favorite server anymore....

Here's the crash report, please any insight would be grateful.

---- Minecraft Crash Report ----
// I let you down. Sorry
Time: 3/9/14 12:46 PM
Description: Ticking entity
java.lang.NullPointerException: Ticking entity
at yb.h(SourceFile:118)
at afy.a(SourceFile:1366)
at afy.g(SourceFile:1344)
at afy.h(SourceFile:1251)
at azl.p(SourceFile:1527)
at azl.ah(SourceFile:757)
at azl.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:148)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at yb.h(SourceFile:118)
at afy.a(SourceFile:1366)
at afy.g(SourceFile:1344)
-- Entity being ticked --
Details:
Entity Type: SmallFireball (yf)
Entity ID: 111403
Entity Name: Small Fireball
Entity's Exact location: 0.00, 0.00, 0.00
Entity's Block location: World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: NaN, NaN, NaN
Stacktrace:
at afy.h(SourceFile:1251)
-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bkl['yadidle'/111401, l='MpServer', x=26.24, y=64.03, z=6.44]]
Chunk stats: MultiplayerChunkCache: 105, 105
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-717,64,-894), Chunk: (at 3,4,2 in -45,-56; contains blocks -720,0,-896 to -705,255,-881), Region: (-2,-2; contains chunks -64,-64 to -33,-33, blocks -1024,0,-1024 to -513,255,-513)
Level time: 82260080 game time, 83828885 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: 126 total; [yf['Small Fireball'/111432, l='MpServer', x=0.00, y=0.00, z=0.00], bkl['yadidle'/111401, l='MpServer', x=26.24, y=64.03, z=6.44], yf['Small Fireball'/111433, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111434, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111435, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111436, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111437, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111438, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111439, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111424, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111425, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111426, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111427, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111428, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111429, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111430, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111431, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111449, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111448, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111451, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111450, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111453, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111452, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111455, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111454, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111441, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111440, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111443, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111442, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111445, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111444, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111447, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111446, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111466, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111467, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111464, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111465, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111470, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111471, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111468, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111469, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111458, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111459, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111456, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111457, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111462, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111463, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111460, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111461, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111483, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111482, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111481, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111480, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111487, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111486, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111485, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111484, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111475, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111474, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111473, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111472, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111479, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111478, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111477, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111476, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111406, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111407, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111404, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111405, l='MpServer', x=0.00, y=0.00, z=0.00], wf['Boat'/111402, l='MpServer', x=26.03, y=63.21, z=6.10], yf['Small Fireball'/111403, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111423, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111422, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111421, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111420, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111419, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111418, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111417, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111416, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111415, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111414, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111413, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111412, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111411, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111410, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111409, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111408, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111493, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111492, l='MpServer', x=0.00, y=0.00, z=0.00], wh['item.tile.dirt.default'/111495, l='MpServer', x=32.31, y=60.13, z=7.88], yf['Small Fireball'/111494, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111489, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111488, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111491, l='MpServer', x=0.00, y=0.00, z=0.00], yf['Small Fireball'/111490, l='MpServer', x=0.00, y=0.00, z=0.00], ww['Creeper'/111501, l='MpServer', x=-9.69, y=63.00, z=45.75], wx['Enderman'/111500, l='MpServer', x=-8.69, y=20.00, z=-1.13], vm['Sheep'/111503, l='MpServer', x=-19.94, y=63.00, z=22.89], vm['Sheep'/111502, l='MpServer', x=49.06, y=63.00, z=-28.44], wx['Enderman'/111497, l='MpServer', x=-14.54, y=20.00, z=-1.14], vm['Sheep'/111496, l='MpServer', x=14.81, y=67.00, z=29.50], wx['Enderman'/111499, l='MpServer', x=-9.44, y=20.00, z=-1.38], wx['Enderman'/111498, l='MpServer', x=-10.52, y=20.00, z=-3.69], vm['Sheep'/111509, l='MpServer', x=-42.47, y=64.00, z=48.13], vm['Sheep'/111510, l='MpServer', x=67.81, y=62.66, z=-62.84], vm['Sheep'/111511, l='MpServer', x=75.13, y=62.66, z=-53.91], xk['Spider'/111504, l='MpServer', x=-6.01, y=63.00, z=48.11], vd['Chicken'/111505, l='MpServer', x=77.80, y=62.45, z=34.17], vm['Sheep'/111506, l='MpServer', x=49.56, y=63.00, z=-60.75], vm['Sheep'/111517, l='MpServer', x=-48.63, y=65.55, z=46.47], vm['Sheep'/111512, l='MpServer', x=74.56, y=63.66, z=-56.66], wh['item.item.egg'/111513, l='MpServer', x=82.84, y=62.89, z=-39.44], vd['Chicken'/111514, l='MpServer', x=95.53, y=62.81, z=-36.53], xn['Zombie'/111527, l='MpServer', x=95.50, y=12.73, z=-60.50], vd['Chicken'/111526, l='MpServer', x=101.47, y=62.38, z=44.47], xn['Zombie'/111525, l='MpServer', x=101.50, y=33.73, z=-31.50], xn['Zombie'/111524, l='MpServer', x=99.50, y=33.73, z=-30.50], xk['Spider'/111523, l='MpServer', x=100.47, y=33.90, z=-28.66], vd['Chicken'/111521, l='MpServer', x=54.44, y=62.44, z=-73.44], vm['Sheep'/111532, l='MpServer', x=96.16, y=63.73, z=-41.34], xn['Zombie'/111531, l='MpServer', x=100.50, y=33.73, z=-32.50], ww['Creeper'/111529, l='MpServer', x=83.50, y=43.73, z=74.50], ww['Creeper'/111528, l='MpServer', x=82.47, y=43.73, z=74.56], vd['Chicken'/111540, l='MpServer', x=103.44, y=62.35, z=69.47], vm['Sheep'/111541, l='MpServer', x=92.16, y=62.73, z=80.84], vm['Sheep'/111538, l='MpServer', x=83.72, y=64.73, z=-64.44]]
Retry entities: 0 total; []
Server brand: CraftBukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at bkg.a(SourceFile:289)
at azl.b(SourceFile:1947)
at azl.f(SourceFile:720)
at net.minecraft.client.main.Main.main(SourceFile:148)
-- System Details --
Details:
Minecraft Version: 1.7.5
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_30, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 84640800 bytes (80 MB) / 242352128 bytes (231 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.5
LWJGL: 2.9.1
OpenGL: ATI Radeon HD 4300/4500 Series GL version 3.3.10750 Compatibility Profile Context, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.
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: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

Contact the server owners and let them help you resolve the issue.

Quote from Tails1

Contact the server owners and let them help you resolve the issue.

This isn't necessarily a problem the server owner can fix

So I should check with the server owners? Singleplayer works still.