This crash occurred while five minutes into playing an mcpatcher-converted-Sphax PureBDcraft 128x MC15 texture pack.

A detailed walkthrough of the error, its code path and all known details is as follows: (this was provided by a crash report document created as soon as the crash occurred.)
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-- Head --
Stacktrace:
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at tj.a(SourceFile:280)
	at bdr.a(SourceFile:287)
	at ayl.a(SourceFile:581)
	at ayl.a(SourceFile:605)
	at ayl.a(SourceFile:590)
	at axr.n(SourceFile:153)
	at axr.m(SourceFile:115)

-- Affected screen --
Details:
	Screen name: ~~ERROR~~ NullPointerException: null

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdv['Wanderer_LR'/282, l='MpServer', x=-181.39, y=76.62, z=261.77]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-187,64,258), Chunk: (at 5,4,2 in -12,16; contains blocks -192,0,256 to -177,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 124775 game time, 201967 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: 98 total; [sf['Skeleton'/10046, l='MpServer', x=-109.50, y=29.00, z=249.50], sf['Skeleton'/11952, l='MpServer', x=-185.50, y=18.00, z=209.50], sf['Skeleton'/11953, l='MpServer', x=-196.50, y=36.00, z=192.50], sf['Skeleton'/11954, l='MpServer', x=-196.50, y=36.00, z=191.50], sj['Zombie'/11654, l='MpServer', x=-117.50, y=31.00, z=244.09], sj['Zombie'/12670, l='MpServer', x=-148.70, y=47.00, z=262.50], bdv['Wanderer_LR'/282, l='MpServer', x=-181.39, y=76.62, z=261.77], sj['Zombie'/12671, l='MpServer', x=-144.50, y=47.00, z=261.50], sj['Zombie'/12668, l='MpServer', x=-146.17, y=47.00, z=262.50], sj['Zombie'/12669, l='MpServer', x=-145.50, y=47.00, z=261.50], qr['Squid'/12204, l='MpServer', x=-219.53, y=59.00, z=323.50], qr['Squid'/12203, l='MpServer', x=-217.47, y=58.19, z=323.50], qr['Squid'/12201, l='MpServer', x=-219.41, y=60.38, z=323.59], qg['Bat'/8146, l='MpServer', x=-111.25, y=35.10, z=313.34], rh['item.tile.sapling.oak'/9482, l='MpServer', x=-185.84, y=72.13, z=269.75], sj['Zombie'/6794, l='MpServer', x=-202.50, y=29.00, z=230.50], ru['Creeper'/10437, l='MpServer', x=-150.50, y=21.00, z=238.50], sf['Skeleton'/12167, l='MpServer', x=-114.53, y=30.00, z=232.06], sj['Zombie'/12174, l='MpServer', x=-213.50, y=28.00, z=232.50], ru['Creeper'/12168, l='MpServer', x=-173.50, y=31.00, z=218.50], sj['Zombie'/10750, l='MpServer', x=-163.22, y=25.00, z=329.44], sj['Zombie'/12263, l='MpServer', x=-139.50, y=28.00, z=195.50], sf['Skeleton'/12261, l='MpServer', x=-134.50, y=46.00, z=195.50], qg['Bat'/10932, l='MpServer', x=-201.13, y=33.10, z=199.31], sj['Zombie'/12264, l='MpServer', x=-141.50, y=28.00, z=194.50], qg['Bat'/10931, l='MpServer', x=-207.75, y=31.10, z=200.34], sh['Spider'/6857, l='MpServer', x=-139.28, y=41.00, z=271.28], ru['Creeper'/11733, l='MpServer', x=-153.50, y=28.00, z=325.50], rh['item.item.apple'/9309, l='MpServer', x=-186.84, y=72.13, z=271.22], rh['item.tile.sapling.oak'/10655, l='MpServer', x=-188.22, y=74.13, z=265.88], sf['Skeleton'/12346, l='MpServer', x=-154.94, y=17.00, z=245.56], qg['Bat'/10919, l='MpServer', x=-99.25, y=14.15, z=227.56], ru['Creeper'/12347, l='MpServer', x=-161.50, y=20.00, z=230.50], ru['Creeper'/12348, l='MpServer', x=-169.44, y=23.00, z=226.91], sj['Zombie'/12350, l='MpServer', x=-199.50, y=33.00, z=196.50], ru['Creeper'/11971, l='MpServer', x=-241.50, y=42.00, z=220.50], sj['Zombie'/11970, l='MpServer', x=-140.50, y=33.00, z=219.50], sj['Zombie'/11969, l='MpServer', x=-139.50, y=33.00, z=218.50], qg['Bat'/11491, l='MpServer', x=-152.26, y=24.53, z=307.04], ru['Creeper'/11972, l='MpServer', x=-240.50, y=42.00, z=219.50], ru['Creeper'/10675, l='MpServer', x=-214.50, y=37.00, z=215.50], sj['Zombie'/11775, l='MpServer', x=-183.50, y=30.00, z=221.50], qo['Sheep'/123, l='MpServer', x=-204.47, y=61.00, z=296.63], sj['Zombie'/10679, l='MpServer', x=-228.50, y=28.00, z=254.50], qi['Chicken'/139, l='MpServer', x=-176.22, y=75.00, z=259.78], qi['Chicken'/141, l='MpServer', x=-176.22, y=75.00, z=261.47], qi['Chicken'/140, l='MpServer', x=-172.78, y=75.00, z=259.78], ru['Creeper'/10334, l='MpServer', x=-112.50, y=32.00, z=225.50], qo['Sheep'/152, l='MpServer', x=-163.19, y=67.00, z=198.16], qg['Bat'/11544, l='MpServer', x=-161.25, y=11.96, z=314.25], ru['Creeper'/11120, l='MpServer', x=-114.50, y=23.00, z=229.50], rh['item.tile.dirt'/8645, l='MpServer', x=-187.59, y=70.13, z=268.19], sf['Skeleton'/12765, l='MpServer', x=-152.50, y=24.00, z=308.50], qo['Sheep'/175, l='MpServer', x=-157.50, y=66.00, z=205.53], qo['Sheep'/172, l='MpServer', x=-153.97, y=67.00, z=191.03], ru['Creeper'/11326, l='MpServer', x=-163.50, y=31.00, z=305.50], sg['Slime'/162, l='MpServer', x=-163.31, y=16.00, z=281.69], ru['Creeper'/6956, l='MpServer', x=-184.50, y=69.00, z=196.50], qi['Chicken'/161, l='MpServer', x=-174.56, y=71.05, z=274.82], ru['Creeper'/9387, l='MpServer', x=-168.50, y=41.00, z=325.50], qi['Chicken'/160, l='MpServer', x=-180.66, y=73.00, z=265.47], sj['Zombie'/6955, l='MpServer', x=-168.22, y=29.00, z=222.22], sj['Zombie'/12750, l='MpServer', x=-196.50, y=24.00, z=299.50], qo['Sheep'/191, l='MpServer', x=-143.50, y=67.00, z=188.50], qg['Bat'/12501, l='MpServer', x=-262.56, y=59.28, z=226.42], qo['Sheep'/176, l='MpServer', x=-144.53, y=64.00, z=222.38], qg['Bat'/12500, l='MpServer', x=-172.34, y=32.64, z=186.59], sf['Skeleton'/11098, l='MpServer', x=-150.50, y=43.00, z=314.13], qg['Bat'/10257, l='MpServer', x=-203.66, y=35.10, z=263.75], qg['Bat'/12461, l='MpServer', x=-147.25, y=33.92, z=305.25], qo['Sheep'/203, l='MpServer', x=-121.34, y=64.00, z=250.47], sj['Zombie'/9423, l='MpServer', x=-215.59, y=17.00, z=189.00], qi['Chicken'/196, l='MpServer', x=-128.63, y=74.00, z=300.44], qo['Sheep'/198, l='MpServer', x=-126.34, y=64.00, z=208.28], qo['Sheep'/193, l='MpServer', x=-140.38, y=64.00, z=227.16], qo['Sheep'/192, l='MpServer', x=-133.09, y=64.00, z=201.88], qo['Sheep'/195, l='MpServer', x=-135.06, y=63.00, z=245.94], qo['Sheep'/194, l='MpServer', x=-140.97, y=63.00, z=243.97], qi['Chicken'/221, l='MpServer', x=-104.53, y=69.00, z=271.34], qi['Chicken'/222, l='MpServer', x=-106.91, y=73.00, z=256.47], qg['Bat'/12477, l='MpServer', x=-127.58, y=40.73, z=259.40], qg['Bat'/12476, l='MpServer', x=-112.51, y=41.53, z=256.05], ru['Creeper'/7486, l='MpServer', x=-114.50, y=65.00, z=263.00], rh['item.tile.sapling.oak'/10796, l='MpServer', x=-185.03, y=72.13, z=269.78], ru['Creeper'/11605, l='MpServer', x=-200.50, y=58.00, z=185.50], ru['Creeper'/11070, l='MpServer', x=-221.50, y=35.00, z=196.50], sj['Zombie'/11875, l='MpServer', x=-259.97, y=27.00, z=327.50], qr['Squid'/9980, l='MpServer', x=-235.25, y=57.34, z=314.91], rh['item.tile.sapling.oak'/10223, l='MpServer', x=-187.72, y=71.13, z=268.00], sj['Zombie'/10206, l='MpServer', x=-224.50, y=30.00, z=257.50], sj['Zombie'/7452, l='MpServer', x=-255.50, y=43.00, z=306.50], ru['Creeper'/11843, l='MpServer', x=-226.50, y=19.00, z=323.50], sj['Zombie'/10765, l='MpServer', x=-117.97, y=26.00, z=225.28], ru['Creeper'/11846, l='MpServer', x=-227.50, y=19.00, z=321.50], sf['Skeleton'/12677, l='MpServer', x=-104.50, y=66.00, z=243.50], sf['Skeleton'/12678, l='MpServer', x=-136.50, y=35.00, z=218.50], ru['Creeper'/11844, l='MpServer', x=-225.50, y=19.00, z=323.50], ru['Creeper'/11845, l='MpServer', x=-228.50, y=19.00, z=324.50]]
	Retry entities: 0 total; []
Stacktrace:
	at bds.a(SourceFile:282)
	at net.minecraft.client.Minecraft.b(SourceFile:1881)
	at net.minecraft.client.Minecraft.run(SourceFile:535)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 1.5.2
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_06, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 355854176 bytes (339 MB) / 760545280 bytes (725 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 1292 (72352 bytes; 0 MB) allocated, 3 (168 bytes; 0 MB) used
	Suspicious classes: [com.prupe.mcpatcher.MCPatcherUtils, Config, MCLogger, ...], [com.prupe.mcpatcher.mod.ColorizeItem, AAHelper, TessellatorUtils, ...]
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	LWJGL: 2.4.2
	OpenGL: GeForce GT 540M/PCI/SSE2 GL version 4.1.0, NVIDIA Corporation
	Is Modded: Very likely; Jar signature invalidated
	Type: Client (map_client.txt)
	Texture Pack: mcpatcher-converted-Sphax PureBDcraft 128x MC15.zip
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 441 (24696 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used