I also have this issue. Killed me when I was carrying enderpearls. Here's a crash report:
---- Minecraft Crash Report ----
// Why did you do that?
Time: 7/14/13 6:11 PM
Description: Manually triggered debug crash
java.lang.Throwable
at ats.k(SourceFile:1238)
at ats.S(SourceFile:663)
at ats.d(SourceFile:619)
at net.minecraft.client.main.Main.main(SourceFile:101)
A detailed walkthrough of the error, its code path and all known details is as follows:
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-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bdf['Spedxing'/278117, l='MpServer', x=-1562.66, y=121.62, z=417.40]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (1,65,-6), Chunk: (at 1,4,10 in 0,-1; contains blocks 0,0,-16 to 15,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 359688579 game time, 368993432 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: 69 total; [bdf['Spedxing'/278117, l='MpServer', x=-1562.66, y=121.62, z=417.40], tm['Zombie Pigman'/278140, l='MpServer', x=-1533.75, y=44.00, z=390.25], tm['Zombie Pigman'/278141, l='MpServer', x=-1525.16, y=51.00, z=394.78], tm['Zombie Pigman'/278142, l='MpServer', x=-1611.50, y=81.00, z=424.50], tm['Zombie Pigman'/278143, l='MpServer', x=-1611.44, y=82.00, z=420.78], tm['Zombie Pigman'/278136, l='MpServer', x=-1523.97, y=12.00, z=403.91], tm['Zombie Pigman'/278137, l='MpServer', x=-1522.59, y=12.00, z=405.84], tm['Zombie Pigman'/278138, l='MpServer', x=-1595.63, y=69.00, z=451.63], tk['Magma Cube'/278139, l='MpServer', x=-1587.69, y=24.00, z=388.69], tm['Zombie Pigman'/278132, l='MpServer', x=-1587.88, y=67.00, z=446.00], tm['Zombie Pigman'/278133, l='MpServer', x=-1597.25, y=43.00, z=415.44], tc['Blaze'/278134, l='MpServer', x=-1579.50, y=60.00, z=390.50], tm['Zombie Pigman'/278135, l='MpServer', x=-1523.47, y=12.00, z=406.50], tm['Zombie Pigman'/278128, l='MpServer', x=-1534.41, y=85.00, z=427.38], tm['Zombie Pigman'/278129, l='MpServer', x=-1548.34, y=51.00, z=411.13], tm['Zombie Pigman'/278130, l='MpServer', x=-1550.88, y=51.00, z=407.94], tm['Zombie Pigman'/278131, l='MpServer', x=-1564.31, y=2.00, z=464.41], tm['Zombie Pigman'/278125, l='MpServer', x=-1554.34, y=83.00, z=426.59], tm['Zombie Pigman'/278124, l='MpServer', x=-1549.31, y=55.00, z=421.66], tm['Zombie Pigman'/278127, l='MpServer', x=-1553.75, y=83.00, z=428.09], tm['Zombie Pigman'/278126, l='MpServer', x=-1547.47, y=85.00, z=431.50], tm['Zombie Pigman'/278121, l='MpServer', x=-1567.31, y=53.00, z=426.84], tm['Zombie Pigman'/278120, l='MpServer', x=-1569.44, y=53.00, z=427.63], tm['Zombie Pigman'/278123, l='MpServer', x=-1549.38, y=53.00, z=418.94], tm['Zombie Pigman'/278122, l='MpServer', x=-1552.38, y=21.00, z=426.09], tm['Zombie Pigman'/278119, l='MpServer', x=-1552.06, y=54.00, z=426.13], tm['Zombie Pigman'/278118, l='MpServer', x=-1554.50, y=23.00, z=429.50], tm['Zombie Pigman'/278163, l='MpServer', x=-1595.41, y=112.00, z=361.66], tm['Zombie Pigman'/278162, l='MpServer', x=-1616.00, y=95.00, z=370.22], tm['Zombie Pigman'/278161, l='MpServer', x=-1524.50, y=91.00, z=443.50], tm['Zombie Pigman'/278160, l='MpServer', x=-1524.28, y=71.00, z=419.00], tm['Zombie Pigman'/278167, l='MpServer', x=-1632.31, y=90.00, z=419.47], tm['Zombie Pigman'/278166, l='MpServer', x=-1617.50, y=93.00, z=479.50], tm['Zombie Pigman'/278165, l='MpServer', x=-1610.53, y=97.00, z=492.28], tm['Zombie Pigman'/278164, l='MpServer', x=-1492.31, y=69.08, z=385.94], ti['Ghast'/278171, l='MpServer', x=-1539.32, y=96.97, z=371.41], tm['Zombie Pigman'/278170, l='MpServer', x=-1612.25, y=95.00, z=363.50], tm['Zombie Pigman'/278169, l='MpServer', x=-1611.69, y=93.00, z=367.06], tm['Zombie Pigman'/278168, l='MpServer', x=-1632.31, y=88.00, z=426.13], tm['Zombie Pigman'/278175, l='MpServer', x=-1638.75, y=90.00, z=416.91], tm['Zombie Pigman'/278174, l='MpServer', x=-1634.47, y=38.00, z=410.69], tm['Zombie Pigman'/278172, l='MpServer', x=-1493.41, y=86.00, z=475.47], tm['Zombie Pigman'/278146, l='MpServer', x=-1513.84, y=79.00, z=421.69], tm['Zombie Pigman'/278147, l='MpServer', x=-1567.50, y=6.00, z=466.50], tm['Zombie Pigman'/278144, l='MpServer', x=-1607.50, y=118.00, z=426.50], tm['Zombie Pigman'/278145, l='MpServer', x=-1510.56, y=79.00, z=425.50], tm['Zombie Pigman'/278150, l='MpServer', x=-1600.56, y=70.00, z=464.50], tm['Zombie Pigman'/278151, l='MpServer', x=-1605.69, y=69.00, z=451.38], tm['Zombie Pigman'/278148, l='MpServer', x=-1612.50, y=75.00, z=439.69], tm['Zombie Pigman'/278154, l='MpServer', x=-1564.34, y=61.00, z=357.78], tm['Zombie Pigman'/278152, l='MpServer', x=-1596.75, y=68.00, z=447.28], tm['Zombie Pigman'/278153, l='MpServer', x=-1605.22, y=79.00, z=385.63], tm['Zombie Pigman'/278158, l='MpServer', x=-1574.69, y=75.00, z=490.00], tm['Zombie Pigman'/278156, l='MpServer', x=-1566.78, y=75.00, z=489.75], tm['Zombie Pigman'/278157, l='MpServer', x=-1564.41, y=78.00, z=484.56], tm['Zombie Pigman'/278193, l='MpServer', x=-1602.50, y=78.00, z=379.69], tm['Zombie Pigman'/278195, l='MpServer', x=-1634.31, y=75.00, z=492.59], tm['Zombie Pigman'/278194, l='MpServer', x=-1634.59, y=74.00, z=489.53], tm['Zombie Pigman'/278197, l='MpServer', x=-1638.75, y=73.00, z=488.97], tm['Zombie Pigman'/278196, l='MpServer', x=-1634.69, y=74.00, z=490.41], tm['Zombie Pigman'/278198, l='MpServer', x=-1487.38, y=103.00, z=366.22], tm['Zombie Pigman'/278203, l='MpServer', x=-1641.50, y=87.00, z=352.84], tm['Zombie Pigman'/278204, l='MpServer', x=-1642.72, y=85.00, z=348.06], tm['Zombie Pigman'/278177, l='MpServer', x=-1501.56, y=72.00, z=481.34], tm['Zombie Pigman'/278178, l='MpServer', x=-1607.91, y=100.00, z=497.69], tm['Zombie Pigman'/278179, l='MpServer', x=-1642.34, y=38.00, z=381.34], tm['Zombie Pigman'/278181, l='MpServer', x=-1513.50, y=100.00, z=341.50], tm['Zombie Pigman'/278189, l='MpServer', x=-1615.47, y=94.00, z=411.94], ti['Ghast'/278191, l='MpServer', x=-1512.45, y=98.90, z=479.61]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at bda.a(SourceFile:284)
at ats.b(SourceFile:1761)
at ats.d(SourceFile:628)
at net.minecraft.client.main.Main.main(SourceFile:101)
-- System Details --
Details:
Minecraft Version: 1.6.2
Operating System: Mac OS X (x86_64) version 10.8.4
Java Version: 1.6.0_51, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 59682224 bytes (56 MB) / 128065536 bytes (122 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 1638 (91728 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: 1.6.2
LWJGL: 2.9.0
OpenGL: AMD Radeon HD 6750M OpenGL Engine GL version 2.1 ATI-1.8.18, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 284 (15904 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used
I notice that it happens sometimes after having run a great distance.