The changelog claims to have fixed the bug with modified spawners causing crashes. It is fixed, however it is still happening with mobs that have custom potion effects.
The report:
---- Minecraft Crash Report ----
// Ooh. Shiny.
Time: 07/06/13 19:20
Description: Loading entity NBT
java.lang.NullPointerException
at nr.a(SourceFile:357)
at ns.a(SourceFile:251)
at th.a(SourceFile:288)
at mz.f(SourceFile:1061)
at aaw.a(SourceFile:116)
at aaw.h(SourceFile:234)
at bhs.a(SourceFile:22)
at bhs.a(SourceFile:17)
at bhs.a(SourceFile:12)
at bhx.a(SourceFile:106)
at bhx.a(SourceFile:98)
at beh.a(SourceFile:317)
at bea.a(SourceFile:834)
at bea.b(SourceFile:682)
at atb.R(SourceFile:683)
at atb.d(SourceFile:616)
at net.minecraft.client.main.Main.main(SourceFile:79)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at nr.a(SourceFile:357)
at ns.a(SourceFile:251)
at th.a(SourceFile:288)
-- Entity being loaded --
Details:
Entity Type: Zombie (th)
Entity ID: 3343
Entity Name: Zombie
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: 0.00, 0.00, 0.00
Stacktrace:
at mz.f(SourceFile:1061)
at aaw.a(SourceFile:116)
at aaw.h(SourceFile:234)
at bhs.a(SourceFile:22)
at bhs.a(SourceFile:17)
at bhs.a(SourceFile:12)
-- Tile Entity Details --
Details:
Name: MobSpawner // arq
Block type: ID #52 (tile.mobSpawner // aop)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (464,73,647), Chunk: (at 0,4,7 in 29,40; contains blocks 464,0,640 to 479,255,655), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
Actual block type: ID #52 (tile.mobSpawner // aop)
Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
at bhx.a(SourceFile:106)
at bhx.a(SourceFile:98)
at beh.a(SourceFile:317)
at bea.a(SourceFile:834)
-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bce['MinerMinerMiney'/12, l='MpServer', x=427.62, y=59.85, z=597.08]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (629,169,1397), Chunk: (at 5,10,5 in 39,87; contains blocks 624,0,1392 to 639,255,1407), Region: (1,2; contains chunks 32,64 to 63,95, blocks 512,0,1024 to 1023,255,1535)
Level time: 3415402 game time, 1384690 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 63 total; [sr['Creeper'/1646, l='MpServer', x=455.50, y=73.00, z=600.50], sr['Creeper'/13, l='MpServer', x=424.38, y=58.00, z=593.53], bce['MinerMinerMiney'/12, l='MpServer', x=427.62, y=59.85, z=597.08], th['Zombie'/15, l='MpServer', x=408.50, y=94.00, z=578.50], sr['Creeper'/17, l='MpServer', x=400.50, y=90.00, z=605.72], td['Skeleton'/16, l='MpServer', x=400.50, y=91.00, z=603.50], td['Skeleton'/19, l='MpServer', x=422.50, y=79.00, z=583.50], th['Zombie'/18, l='MpServer', x=431.50, y=82.00, z=572.31], th['Zombie'/21, l='MpServer', x=427.74, y=79.00, z=580.94], th['Zombie'/20, l='MpServer', x=423.78, y=79.00, z=584.16], td['Skeleton'/23, l='MpServer', x=425.50, y=94.00, z=674.50], th['Zombie'/22, l='MpServer', x=428.58, y=79.00, z=580.15], td['Skeleton'/1651, l='MpServer', x=460.50, y=88.00, z=567.50], th['Zombie'/25, l='MpServer', x=434.78, y=96.00, z=562.50], th['Zombie'/1650, l='MpServer', x=454.50, y=73.00, z=613.50], th['Zombie'/24, l='MpServer', x=447.50, y=85.00, z=567.50], th['Zombie'/27, l='MpServer', x=432.56, y=78.00, z=578.50], tf['Spider'/26, l='MpServer', x=432.22, y=77.00, z=581.75], sr['Creeper'/29, l='MpServer', x=442.50, y=77.00, z=577.50], sr['Creeper'/28, l='MpServer', x=439.50, y=77.00, z=578.50], sr['Creeper'/31, l='MpServer', x=442.41, y=77.00, z=578.50], sr['Creeper'/30, l='MpServer', x=444.50, y=77.00, z=578.50], sr['Creeper'/35, l='MpServer', x=454.50, y=92.00, z=563.50], ra['Bat'/32, l='MpServer', x=439.98, y=59.67, z=599.39], td['Skeleton'/33, l='MpServer', x=442.50, y=72.00, z=627.50], th['Zombie'/38, l='MpServer', x=463.50, y=88.00, z=567.50], td['Skeleton'/39, l='MpServer', x=449.97, y=85.00, z=567.53], td['Skeleton'/36, l='MpServer', x=441.97, y=94.00, z=562.50], th['Zombie'/37, l='MpServer', x=462.50, y=88.00, z=567.50], tf['Spider'/42, l='MpServer', x=462.34, y=78.00, z=587.50], th['Zombie'/43, l='MpServer', x=453.88, y=76.00, z=586.47], td['Skeleton'/40, l='MpServer', x=456.50, y=97.00, z=561.50], ra['Bat'/2948, l='MpServer', x=500.25, y=62.33, z=656.09], tf['Spider'/41, l='MpServer', x=461.81, y=78.00, z=582.72], sr['Creeper'/46, l='MpServer', x=456.50, y=76.00, z=588.50], td['Skeleton'/47, l='MpServer', x=454.00, y=76.00, z=585.28], th['Zombie'/44, l='MpServer', x=452.75, y=77.00, z=579.88], td['Skeleton'/45, l='MpServer', x=461.38, y=78.00, z=586.22], td['Skeleton'/51, l='MpServer', x=456.50, y=71.00, z=671.50], td['Skeleton'/50, l='MpServer', x=461.50, y=71.00, z=671.50], sr['Creeper'/49, l='MpServer', x=455.78, y=73.00, z=609.69], sr['Creeper'/48, l='MpServer', x=451.50, y=73.00, z=613.50], sr['Creeper'/55, l='MpServer', x=476.50, y=87.00, z=571.50], ss['Enderman'/54, l='MpServer', x=474.31, y=85.00, z=573.84], tf['Spider'/53, l='MpServer', x=482.84, y=85.00, z=573.72], sr['Creeper'/52, l='MpServer', x=469.13, y=83.00, z=573.34], td['Skeleton'/59, l='MpServer', x=468.50, y=84.00, z=572.50], sr['Creeper'/58, l='MpServer', x=470.88, y=84.00, z=572.59], sr['Creeper'/57, l='MpServer', x=471.70, y=84.00, z=572.31], td['Skeleton'/56, l='MpServer', x=472.16, y=82.00, z=577.47], sr['Creeper'/63, l='MpServer', x=471.50, y=79.00, z=581.50], th['Zombie'/62, l='MpServer', x=476.97, y=77.00, z=588.41], th['Zombie'/61, l='MpServer', x=473.16, y=79.00, z=581.50], sr['Creeper'/60, l='MpServer', x=470.92, y=86.00, z=571.50], th['Zombie'/68, l='MpServer', x=485.50, y=73.00, z=663.50], td['Skeleton'/69, l='MpServer', x=485.50, y=71.00, z=658.50], sr['Creeper'/64, l='MpServer', x=469.50, y=81.00, z=577.50], sr['Creeper'/66, l='MpServer', x=479.78, y=74.00, z=670.84], th['Zombie'/67, l='MpServer', x=483.50, y=73.00, z=664.50], np['entity.ItemFrame.name'/76, l='MpServer', x=505.06, y=67.50, z=612.50], np['entity.ItemFrame.name'/75, l='MpServer', x=500.06, y=101.50, z=565.50], ra['Bat'/81, l='MpServer', x=505.44, y=63.57, z=658.44], ra['Bat'/82, l='MpServer', x=502.22, y=60.10, z=655.13]]
Retry entities: 0 total; []
Stacktrace:
at bcb.a(SourceFile:282)
at atb.b(SourceFile:1795)
at atb.d(SourceFile:625)
at net.minecraft.client.main.Main.main(SourceFile:79)
-- System Details --
Details:
Minecraft Version: 13w23a
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_11, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 166083024 bytes (158 MB) / 559480832 bytes (533 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 14931 (836136 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 13w23a
LWJGL: 2.9.0
OpenGL: GeForce 9300M GS/PCI/SSE2 GL version 3.0.0, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1157 (64792 bytes; 0 MB) allocated, 25 (1400 bytes; 0 MB) usedLinked issues
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