When i try to join our private survival server in my base than my minecraft just crashes and my friend crashes in his base aswell. and it did work in the last snapshot 14w17a. and this is the crash report: ---- Minecraft Crash Report ----
// Why is it breaking

Time: 1-5-14 13:07
Description: Rendering entity in world

java.lang.NullPointerException: Rendering entity in world
at cce.a(SourceFile:79)
at cce.a(SourceFile:53)
at cce.a(SourceFile:24)
at cbt.a(SourceFile:219)
at cbt.a(SourceFile:199)
at cbt.a(SourceFile:176)
at bxs.a(SourceFile:495)
at bxl.a(SourceFile:1146)
at bxl.b(SourceFile:937)
at bjf.ai(SourceFile:828)
at bjf.f(SourceFile:755)
at net.minecraft.client.main.Main.main(SourceFile:121)

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

– Head –
Stacktrace:
at cce.a(SourceFile:79)
at cce.a(SourceFile:53)
at cce.a(SourceFile:24)

– Entity being rendered –
Details:
Entity Type: ItemFrame (uh)
Entity ID: 186
Entity Name: entity.ItemFrame.name
Entity's Exact location: 8420,03, 110,50, 9444,50
Entity's Block location: 8420,00,110,00,9444,00 - World: (8420,110,9444), Chunk: (at 4,6,4 in 526,590; contains blocks 8416,0,9440 to 8431,255,9455), Region: (16,18; contains chunks 512,576 to 543,607, blocks 8192,0,9216 to 8703,255,9727)
Entity's Momentum: 0,00, 0,00, 0,00
Entity's Rider: ~_ERROR~ NullPointerException: null
Entity's Vehicle: ~_ERROR~ NullPointerException: null

– Renderer details –
Details:
Assigned renderer: cce@8cb83c4
Location: -2,37,2,68,-6,44 - World: (-3,2,-7), Chunk: (at 13,0,9 in -1,-1; contains blocks -16,0,-16 to -1,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Rotation: -90.0
Delta: 0.072246194
Stacktrace:
at cbt.a(SourceFile:219)
at cbt.a(SourceFile:199)
at cbt.a(SourceFile:176)
at bxs.a(SourceFile:495)
at bxl.a(SourceFile:1146)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bxb['tombrugmans'/108, l='MpServer', x=8422,40, y=107,73, z=9450,94]]
Chunk stats: MultiplayerChunkCache: 5, 5
Level seed: 0
Level generator: ID 03 - amplified, ver 0. Features enabled: false
Level generator options:
Level spawn location: -271,00,66,00,1185,00 - World: (-271,66,1185), Chunk: (at 1,4,1 in -17,74; contains blocks -272,0,1184 to -257,255,1199), Region: (-1,2; contains chunks -32,64 to -1,95, blocks -512,0,1024 to -1,255,1535)
Level time: 258387492 game time, 2376877 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: 110 total; [bxb['tombrugmans'/108, l='MpServer', x=8422,40, y=107,73, z=9450,94], uh['entity.ItemFrame.name'/305, l='MpServer', x=8432,50, y=53,50, z=9455,03], zy['Creeper'/296, l='MpServer', x=8424,38, y=80,00, z=9462,97], aay['Skeleton'/297, l='MpServer', x=8423,13, y=128,00, z=9466,50], uh['entity.ItemFrame.name'/110, l='MpServer', x=8427,97, y=101,50, z=9450,50], uh['entity.ItemFrame.name'/111, l='MpServer', x=8427,97, y=102,50, z=9450,50], uh['entity.ItemFrame.name'/109, l='MpServer', x=8425,50, y=62,50, z=9443,97], uh['entity.ItemFrame.name'/119, l='MpServer', x=8427,97, y=103,50, z=9454,50], uh['entity.ItemFrame.name'/118, l='MpServer', x=8427,97, y=104,50, z=9454,50], uh['entity.ItemFrame.name'/117, l='MpServer', x=8427,97, y=104,50, z=9452,50], uh['entity.ItemFrame.name'/116, l='MpServer', x=8427,97, y=103,50, z=9452,50], uh['entity.ItemFrame.name'/115, l='MpServer', x=8427,97, y=102,50, z=9452,50], uh['entity.ItemFrame.name'/114, l='MpServer', x=8427,97, y=101,50, z=9452,50], uh['entity.ItemFrame.name'/113, l='MpServer', x=8427,97, y=104,50, z=9450,50], uh['entity.ItemFrame.name'/112, l='MpServer', x=8427,97, y=103,50, z=9450,50], uh['entity.ItemFrame.name'/127, l='MpServer', x=8427,97, y=104,50, z=9448,50], uh['entity.ItemFrame.name'/126, l='MpServer', x=8427,97, y=103,50, z=9448,50], uh['entity.ItemFrame.name'/125, l='MpServer', x=8427,97, y=102,50, z=9448,50], uh['entity.ItemFrame.name'/124, l='MpServer', x=8427,97, y=101,50, z=9448,50], uh['entity.ItemFrame.name'/123, l='MpServer', x=8426,50, y=103,50, z=9454,97], uh['entity.ItemFrame.name'/122, l='MpServer', x=8426,50, y=102,50, z=9454,97], uh['entity.ItemFrame.name'/121, l='MpServer', x=8426,50, y=101,50, z=9454,97], uh['entity.ItemFrame.name'/120, l='MpServer', x=8427,97, y=102,50, z=9454,50], uh['entity.ItemFrame.name'/137, l='MpServer', x=8418,50, y=103,50, z=9447,03], uh['entity.ItemFrame.name'/136, l='MpServer', x=8418,50, y=104,50, z=9447,03], uh['entity.ItemFrame.name'/139, l='MpServer', x=8418,50, y=101,50, z=9447,03], uh['entity.ItemFrame.name'/138, l='MpServer', x=8418,50, y=102,50, z=9447,03], uh['entity.ItemFrame.name'/141, l='MpServer', x=8416,50, y=102,50, z=9447,03], uh['entity.ItemFrame.name'/140, l='MpServer', x=8416,50, y=101,50, z=9447,03], uh['entity.ItemFrame.name'/143, l='MpServer', x=8416,50, y=104,50, z=9447,03], uh['entity.ItemFrame.name'/142, l='MpServer', x=8416,50, y=103,50, z=9447,03], uh['entity.ItemFrame.name'/129, l='MpServer', x=8427,50, y=102,50, z=9447,03], uh['entity.ItemFrame.name'/128, l='MpServer', x=8427,50, y=101,50, z=9447,03], uh['entity.ItemFrame.name'/131, l='MpServer', x=8427,50, y=104,50, z=9447,03], uh['entity.ItemFrame.name'/130, l='MpServer', x=8427,50, y=103,50, z=9447,03], uh['entity.ItemFrame.name'/133, l='MpServer', x=8425,50, y=103,50, z=9447,03], uh['entity.ItemFrame.name'/132, l='MpServer', x=8425,50, y=104,50, z=9447,03], uh['entity.ItemFrame.name'/135, l='MpServer', x=8425,50, y=101,50, z=9447,03], uh['entity.ItemFrame.name'/134, l='MpServer', x=8425,50, y=102,50, z=9447,03], uh['entity.ItemFrame.name'/152, l='MpServer', x=8416,03, y=103,50, z=9452,50], uh['entity.ItemFrame.name'/153, l='MpServer', x=8416,03, y=102,50, z=9452,50], uh['entity.ItemFrame.name'/154, l='MpServer', x=8416,03, y=101,50, z=9452,50], uh['entity.ItemFrame.name'/155, l='MpServer', x=8416,03, y=101,50, z=9454,50], uh['entity.ItemFrame.name'/156, l='MpServer', x=8416,03, y=102,50, z=9454,50], uh['entity.ItemFrame.name'/157, l='MpServer', x=8416,03, y=103,50, z=9454,50], uh['entity.ItemFrame.name'/158, l='MpServer', x=8416,03, y=104,50, z=9454,50], uh['entity.ItemFrame.name'/159, l='MpServer', x=8417,50, y=103,50, z=9454,97], uh['entity.ItemFrame.name'/144, l='MpServer', x=8416,03, y=104,50, z=9448,50], uh['entity.ItemFrame.name'/145, l='MpServer', x=8416,03, y=103,50, z=9448,50], uh['entity.ItemFrame.name'/146, l='MpServer', x=8416,03, y=102,50, z=9448,50], uh['entity.ItemFrame.name'/147, l='MpServer', x=8416,03, y=101,50, z=9448,50], uh['entity.ItemFrame.name'/148, l='MpServer', x=8416,03, y=102,50, z=9450,50], uh['entity.ItemFrame.name'/149, l='MpServer', x=8416,03, y=103,50, z=9450,50], uh['entity.ItemFrame.name'/150, l='MpServer', x=8416,03, y=104,50, z=9450,50], uh['entity.ItemFrame.name'/151, l='MpServer', x=8416,03, y=104,50, z=9452,50], uh['entity.ItemFrame.name'/171, l='MpServer', x=8421,50, y=102,50, z=9446,03], uh['entity.ItemFrame.name'/170, l='MpServer', x=8420,50, y=101,50, z=9446,03], uh['entity.ItemFrame.name'/169, l='MpServer', x=8422,50, y=101,50, z=9446,03], uh['entity.ItemFrame.name'/168, l='MpServer', x=8422,50, y=102,50, z=9446,03], uh['entity.ItemFrame.name'/175, l='MpServer', x=8420,50, y=103,50, z=9446,03], uh['entity.ItemFrame.name'/174, l='MpServer', x=8420,50, y=104,50, z=9446,03], uh['entity.ItemFrame.name'/173, l='MpServer', x=8421,50, y=104,50, z=9446,03], uh['entity.ItemFrame.name'/172, l='MpServer', x=8421,50, y=103,50, z=9446,03], uh['entity.ItemFrame.name'/163, l='MpServer', x=8423,50, y=102,50, z=9446,03], uh['entity.ItemFrame.name'/162, l='MpServer', x=8423,50, y=101,50, z=9446,03], uh['entity.ItemFrame.name'/161, l='MpServer', x=8417,50, y=101,50, z=9454,97], uh['entity.ItemFrame.name'/160, l='MpServer', x=8417,50, y=102,50, z=9454,97], uh['entity.ItemFrame.name'/167, l='MpServer', x=8422,50, y=103,50, z=9446,03], uh['entity.ItemFrame.name'/166, l='MpServer', x=8422,50, y=104,50, z=9446,03], uh['entity.ItemFrame.name'/165, l='MpServer', x=8423,50, y=104,50, z=9446,03], uh['entity.ItemFrame.name'/164, l='MpServer', x=8423,50, y=103,50, z=9446,03], uh['entity.ItemFrame.name'/186, l='MpServer', x=8420,03, y=110,50, z=9444,50], uh['entity.ItemFrame.name'/187, l='MpServer', x=8420,03, y=110,50, z=9443,50], uh['entity.ItemFrame.name'/184, l='MpServer', x=8420,03, y=110,50, z=9446,50], uh['entity.ItemFrame.name'/185, l='MpServer', x=8420,03, y=110,50, z=9445,50], uh['entity.ItemFrame.name'/190, l='MpServer', x=8420,03, y=110,50, z=9447,50], uh['entity.ItemFrame.name'/191, l='MpServer', x=8423,50, y=105,50, z=9446,03], uh['entity.ItemFrame.name'/188, l='MpServer', x=8420,03, y=110,50, z=9442,50], uh['entity.ItemFrame.name'/189, l='MpServer', x=8420,03, y=110,50, z=9441,50], uh['entity.ItemFrame.name'/178, l='MpServer', x=8420,03, y=110,50, z=9453,50], uh['entity.ItemFrame.name'/179, l='MpServer', x=8420,03, y=110,50, z=9452,50], uh['entity.ItemFrame.name'/176, l='MpServer', x=8420,50, y=102,50, z=9446,03], uh['entity.ItemFrame.name'/177, l='MpServer', x=8420,03, y=110,50, z=9454,50], uh['entity.ItemFrame.name'/182, l='MpServer', x=8420,03, y=110,50, z=9449,50], uh['entity.ItemFrame.name'/183, l='MpServer', x=8420,03, y=110,50, z=9448,50], uh['entity.ItemFrame.name'/180, l='MpServer', x=8420,03, y=110,50, z=9451,50], uh['entity.ItemFrame.name'/181, l='MpServer', x=8420,03, y=110,50, z=9450,50], uh['entity.ItemFrame.name'/205, l='MpServer', x=8416,03, y=105,50, z=9448,50], uh['entity.ItemFrame.name'/204, l='MpServer', x=8418,50, y=105,50, z=9447,03], uh['entity.ItemFrame.name'/207, l='MpServer', x=8416,03, y=105,50, z=9450,50], uh['entity.ItemFrame.name'/206, l='MpServer', x=8416,50, y=105,50, z=9447,03], uh['entity.ItemFrame.name'/201, l='MpServer', x=8427,97, y=105,50, z=9448,50], uh['entity.ItemFrame.name'/200, l='MpServer', x=8427,97, y=105,50, z=9450,50], uh['entity.ItemFrame.name'/203, l='MpServer', x=8425,50, y=105,50, z=9447,03], uh['entity.ItemFrame.name'/202, l='MpServer', x=8427,50, y=105,50, z=9447,03], uh['entity.ItemFrame.name'/197, l='MpServer', x=8427,97, y=105,50, z=9454,50], uh['entity.ItemFrame.name'/196, l='MpServer', x=8417,50, y=104,50, z=9454,97], uh['entity.ItemFrame.name'/199, l='MpServer', x=8427,97, y=105,50, z=9452,50], uh['entity.ItemFrame.name'/198, l='MpServer', x=8426,50, y=105,50, z=9454,97], uh['entity.ItemFrame.name'/193, l='MpServer', x=8416,03, y=101,50, z=9450,50], uh['entity.ItemFrame.name'/192, l='MpServer', x=8420,50, y=105,50, z=9446,03], uh['entity.ItemFrame.name'/195, l='MpServer', x=8427,97, y=101,50, z=9454,50], uh['entity.ItemFrame.name'/194, l='MpServer', x=8421,50, y=101,50, z=9446,03], zk['container.minecart'/212, l='MpServer', x=8426,50, y=112,06, z=9455,50], zy['Creeper'/213, l='MpServer', x=8424,56, y=132,00, z=9452,28], zy['Creeper'/214, l='MpServer', x=8424,94, y=135,00, z=9449,63], uh['entity.ItemFrame.name'/208, l='MpServer', x=8416,03, y=105,50, z=9452,50], uh['entity.ItemFrame.name'/209, l='MpServer', x=8416,03, y=105,50, z=9454,50], uh['entity.ItemFrame.name'/210, l='MpServer', x=8417,50, y=105,50, z=9454,97], uh['entity.ItemFrame.name'/211, l='MpServer', x=8426,50, y=104,50, z=9454,97]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at buw.a(SourceFile:308)
at bjf.b(SourceFile:2069)
at bjf.f(SourceFile:764)
at net.minecraft.client.main.Main.main(SourceFile:121)

– System Details –
Details:
Minecraft Version: 14w18a
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 158400776 bytes (151 MB) / 256901120 bytes (245 MB) up to 2863661056 bytes (2731 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 14w18a
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 9.17.10.2867, Intel
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.
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)
Anisotropic Filtering: Off (1)