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On servers at times when It gets intense my MC crashes. Theres seems to be two descrptions:
Ticking Entity and rendering item
Heres one of the crash reports:

---- Minecraft Crash Report ----
// Why did you do that?

Time: 1/8/14 7:25 AM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at abu.a(SourceFile:331)
at xo.k(SourceFile:203)
at xq.e(SourceFile:430)
at bmd.e(SourceFile:205)
at rm.h(SourceFile:1208)
at xq.h(SourceFile:240)
at bkf.h(SourceFile:63)
at afs.a(SourceFile:1368)
at afs.g(SourceFile:1346)
at afs.h(SourceFile:1253)
at azi.p(SourceFile:1532)
at azi.ah(SourceFile:760)
at azi.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:152)


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

-- Head --
Stacktrace:
at abu.a(SourceFile:331)
at xo.k(SourceFile:203)
at xq.e(SourceFile:430)
at bmd.e(SourceFile:205)
at rm.h(SourceFile:1208)
at xq.h(SourceFile:240)
at bkf.h(SourceFile:63)
at afs.a(SourceFile:1368)
at afs.g(SourceFile:1346)

-- Entity being ticked --
Details:
Entity Type: null (bkf)
Entity ID: 411226
Entity Name: Bamfcraft
Entity's Exact location: 427.31, 87.20, 463.29
Entity's Block location: World: (427,87,463), Chunk: (at 11,5,15 in 26,28; contains blocks 416,0,448 to 431,255,463), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: -0.02, -0.28, -0.02
Stacktrace:
at afs.h(SourceFile:1253)

-- Affected level --
Details:
Level name: MpServer
All players: 10 total; [bkf['Bamfcraft'/411226, l='MpServer', x=427.31, y=87.20, z=463.29], bme['§anathan_mcafee'/5835, l='MpServer', x=450.96, y=86.05, z=463.60], bme['§apopupkiller'/5876, l='MpServer', x=437.94, y=85.00, z=463.16], bme['§amarcustab3'/5323, l='MpServer', x=435.25, y=85.00, z=462.69], bme['§aTurtlexs'/6305, l='MpServer', x=436.00, y=85.00, z=464.66], bme['§alalala72'/6621, l='MpServer', x=421.31, y=85.00, z=423.31], bme['§6lauren586'/5782, l='MpServer', x=435.69, y=85.00, z=463.69], bme['§ahoujou'/6802, l='MpServer', x=464.50, y=85.00, z=445.50], bme['§6houjou'/3954, l='MpServer', x=463.69, y=85.00, z=431.84], bme['§cChaoschimera'/6649, l='MpServer', x=426.78, y=84.94, z=463.66]]
Chunk stats: MultiplayerChunkCache: 121, 121
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,73,5), Chunk: (at 0,4,5 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)
Level time: 655560257 game time, 655601134 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: 48 total; [bme['houjou'/3954, l='MpServer', x=450.31, y=75.50, z=431.31], bme['§aChaoschimera'/6649, l='MpServer', x=445.00, y=75.01, z=449.17], bme['§anathan_mcafee'/5835, l='MpServer', x=450.96, y=86.05, z=463.60], bme['§ahoujou'/6802, l='MpServer', x=464.50, y=85.00, z=445.50], bme['§cChaoschimera'/6649, l='MpServer', x=465.06, y=85.00, z=432.38], bme['§6Chaoschimera'/6649, l='MpServer', x=440.03, y=85.00, z=463.80], bme['§6lauren586'/5782, l='MpServer', x=435.69, y=85.00, z=463.69], bme['§6houjou'/3954, l='MpServer', x=463.69, y=85.00, z=431.84], bme['§aTurtlexs'/6305, l='MpServer', x=436.00, y=85.00, z=464.66], bme['nathan_mcafee'/5835, l='MpServer', x=450.00, y=80.00, z=452.28], xt['arrow'/6846, l='MpServer', x=435.50, y=86.50, z=464.47], bme['Armagoto'/6096, l='MpServer', x=443.59, y=80.00, z=448.03], bme['marcustab3'/5323, l='MpServer', x=443.56, y=80.00, z=433.97], bme['KayKayTab'/6001, l='MpServer', x=441.31, y=80.00, z=433.31], bme['popupkiller'/5876, l='MpServer', x=443.38, y=80.00, z=435.09], bme['marcustab3'/5323, l='MpServer', x=443.59, y=80.00, z=435.34], wb['item.tile.stonebricksmooth.default'/6838, l='MpServer', x=438.44, y=80.13, z=460.88], bme['§amarcustab3'/5323, l='MpServer', x=435.25, y=85.00, z=462.69], bkf['Bamfcraft'/411226, l='MpServer', x=427.31, y=87.20, z=463.29], bme['Turtlexs'/6305, l='MpServer', x=451.23, y=76.57, z=441.20], bme['§apopupkiller'/5876, l='MpServer', x=437.94, y=85.00, z=463.16], bme['lzrslayongdiemnd'/4169, l='MpServer', x=437.44, y=80.00, z=443.88], bme['lalala72'/6621, l='MpServer', x=455.59, y=75.00, z=437.75], bme['lauren586'/5782, l='MpServer', x=441.14, y=80.00, z=449.06], bme['§6houjou'/3954, l='MpServer', x=463.69, y=85.00, z=431.84], bme['Chaoschimera'/6649, l='MpServer', x=451.31, y=75.50, z=441.94], bme['§6lauren586'/5782, l='MpServer', x=435.69, y=85.00, z=463.69], bme['popupkiller'/5876, l='MpServer', x=445.83, y=75.00, z=450.27], bme['lzrslayongdiemnd'/4169, l='MpServer', x=450.31, y=75.00, z=433.38], bme['§amarcustab3'/5323, l='MpServer', x=435.25, y=85.00, z=462.69], bme['§apopupkiller'/5876, l='MpServer', x=437.94, y=85.00, z=463.16], bme['§alauren586'/5782, l='MpServer', x=464.53, y=85.00, z=443.75], bme['§anathan_mcafee'/5835, l='MpServer', x=450.96, y=86.05, z=463.60], bme['§aChaoschimera'/6649, l='MpServer', x=465.55, y=85.61, z=438.42], bme['§alalala72'/6621, l='MpServer', x=421.31, y=85.00, z=423.31], bme['§aTurtlexs'/6305, l='MpServer', x=436.00, y=85.00, z=464.66], bme['§cChaoschimera'/6649, l='MpServer', x=426.78, y=84.94, z=463.66], bme['lauren586'/5782, l='MpServer', x=428.00, y=85.00, z=436.00], bme['Armagoto'/6096, l='MpServer', x=451.50, y=75.00, z=431.78], bme['houjou'/3954, l='MpServer', x=438.59, y=80.00, z=430.03], bme['§alalala72'/6621, l='MpServer', x=445.00, y=75.00, z=449.04], bme['§aTurtlexs'/6305, l='MpServer', x=427.96, y=85.92, z=437.28], bme['§alalala72'/6621, l='MpServer', x=421.31, y=85.00, z=423.31], bme['houjou'/3954, l='MpServer', x=443.02, y=80.00, z=434.52], bme['§ahoujou'/6802, l='MpServer', x=464.50, y=85.00, z=445.50], bme['zombiemansbro'/6224, l='MpServer', x=452.69, y=75.00, z=441.31], bme['nathan_mcafee'/5835, l='MpServer', x=443.00, y=80.02, z=433.00], bme['§ahoujou'/3954, l='MpServer', x=462.54, y=85.27, z=463.27]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at bka.a(SourceFile:289)
at azi.b(SourceFile:1952)
at azi.f(SourceFile:720)
at net.minecraft.client.main.Main.main(SourceFile:152)

-- System Details --
Details:
Minecraft Version: 1.7.4
Operating System: Mac OS X (x86_64) version 10.7.5
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 66986344 bytes (63 MB) / 146796544 bytes (139 MB) up to 1069416448 bytes (1019 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 1213 (67928 bytes; 0 MB) allocated, 9 (504 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.7.4
LWJGL: 2.9.1
OpenGL: NVIDIA GeForce 9400M OpenGL Engine GL version 2.1 NVIDIA-7.32.12, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because ARB_framebuffer_object 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: 159 (8904 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used
Anisotropic Filtering: Off (1)



My MC has crashed multiple times recently only at times when I have a low FPS and things get a little laggy. This problem is new and I haven' changed anything. No mods or new texture packs
Anyone have similar experiences? Is there a solution?
Thanks

That's an issue with the server. Please contact the server admins and let them help you resolve the issue.

Are you Trying to join a modded server without the mod if so thats probably why or Like Tails1 Said its the server's issue so ya.

Quote from chase03

Are you Trying to join a modded server without the mod if so thats probably why or Like Tails1 Said its the server's issue so ya.

The thing is, I've been on the server for awhile and Its only started recently. Its also happened on a different server