Game will crash client-side during inventory editing on server.
Crash report as follows:
---- Minecraft Crash Report ----
// I feel sad now

Time: 7/29/13 6:14 PM
Description: Updating screen events

java.lang.IndexOutOfBoundsException: Index: 55, Size: 45
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at ux.a(SourceFile:282)
at bcz.a(SourceFile:295)
at awv.a(SourceFile:582)
at awv.a(SourceFile:606)
at awv.a(SourceFile:591)
at awb.n(SourceFile:149)
at awb.m(SourceFile:111)
at ats.k(SourceFile:1158)
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:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at ux.a(SourceFile:282)
at bcz.a(SourceFile:295)
at awv.a(SourceFile:582)
at awv.a(SourceFile:606)
at awv.a(SourceFile:591)
at awb.n(SourceFile:149)
at awb.m(SourceFile:111)

– Affected screen –
Details:
Screen name: ~_ERROR~ NullPointerException: null

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdf['declanmar'/57797, l='MpServer', x=-43.24, y=39.62, z=227.13]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-168,64,248), Chunk: (at 8,4,8 in -11,15; contains blocks -176,0,240 to -161,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 8051773 game time, 25360 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: 159 total; [rx['Pig'/57808, l='MpServer', x=-5.47, y=72.00, z=227.22], bdf['declanmar'/57797, l='MpServer', x=-43.24, y=39.62, z=227.13], rx['Pig'/57809, l='MpServer', x=-8.84, y=72.00, z=223.50], rq['Cow'/57810, l='MpServer', x=-3.75, y=72.00, z=222.50], rq['Cow'/57813, l='MpServer', x=-2.22, y=72.00, z=224.28], tv['Zombie'/64801, l='MpServer', x=3.50, y=30.00, z=185.50], tv['Zombie'/65286, l='MpServer', x=-37.94, y=41.00, z=150.34], te['Creeper'/65055, l='MpServer', x=-69.50, y=24.00, z=286.50], tv['Zombie'/66881, l='MpServer', x=-45.50, y=59.00, z=247.50], tv['Zombie'/66880, l='MpServer', x=-39.50, y=59.00, z=248.50], tq['Skeleton'/66082, l='MpServer', x=19.50, y=46.00, z=166.50], tq['Skeleton'/66904, l='MpServer', x=13.50, y=50.00, z=160.50], tq['Skeleton'/66081, l='MpServer', x=23.50, y=46.00, z=168.50], ry['Sheep'/57799, l='MpServer', x=-9.50, y=76.00, z=226.16], ry['Sheep'/57798, l='MpServer', x=-3.47, y=76.00, z=226.16], ry['Sheep'/57801, l='MpServer', x=-4.22, y=76.00, z=227.34], ry['Sheep'/57800, l='MpServer', x=-9.06, y=76.00, z=227.34], ry['Sheep'/57803, l='MpServer', x=-1.50, y=76.00, z=226.16], ry['Sheep'/57802, l='MpServer', x=-3.16, y=76.00, z=227.53], rq['Cow'/57805, l='MpServer', x=-8.72, y=72.00, z=222.28], tq['Skeleton'/66899, l='MpServer', x=-115.50, y=36.00, z=191.50], rq['Cow'/57804, l='MpServer', x=-8.91, y=72.00, z=226.50], rq['Cow'/57807, l='MpServer', x=-3.13, y=72.00, z=221.16], rq['Cow'/57806, l='MpServer', x=-11.53, y=73.09, z=220.56], tv['Zombie'/66686, l='MpServer', x=29.09, y=27.00, z=156.47], ry['Sheep'/57842, l='MpServer', x=-7.50, y=76.00, z=220.47], rp['Chicken'/57843, l='MpServer', x=-12.53, y=74.69, z=215.88], te['Creeper'/66070, l='MpServer', x=-124.50, y=60.00, z=300.50], ry['Sheep'/57840, l='MpServer', x=-8.63, y=76.00, z=221.09], tv['Zombie'/66685, l='MpServer', x=11.59, y=31.00, z=158.00], ry['Sheep'/57841, l='MpServer', x=-9.84, y=76.00, z=220.47], rp['Chicken'/57846, l='MpServer', x=-11.81, y=74.95, z=215.81], rp['Chicken'/57847, l='MpServer', x=-12.78, y=74.89, z=216.53], rp['Chicken'/57844, l='MpServer', x=-13.19, y=74.95, z=215.81], rp['Chicken'/57845, l='MpServer', x=-12.16, y=74.75, z=217.19], te['Creeper'/66319, l='MpServer', x=-64.50, y=12.00, z=166.50], rq['Cow'/57850, l='MpServer', x=-11.53, y=73.09, z=227.44], ry['Sheep'/57851, l='MpServer', x=-0.19, y=76.00, z=220.69], tq['Skeleton'/66919, l='MpServer', x=-119.30, y=32.58, z=191.84], ry['Sheep'/57848, l='MpServer', x=-4.81, y=76.00, z=220.66], tq['Skeleton'/66079, l='MpServer', x=23.13, y=48.00, z=159.47], ry['Sheep'/57849, l='MpServer', x=-5.53, y=76.00, z=221.84], ry['Sheep'/57854, l='MpServer', x=-4.13, y=76.00, z=224.44], sr['item.item.bone'/65599, l='MpServer', x=-67.94, y=83.13, z=240.06], ry['Sheep'/57855, l='MpServer', x=-13.38, y=76.00, z=223.50], rq['Cow'/57852, l='MpServer', x=-7.63, y=72.00, z=221.06], sr['item.item.arrow'/65597, l='MpServer', x=-67.13, y=81.13, z=241.94], rq['Cow'/57853, l='MpServer', x=-4.06, y=72.00, z=223.78], oc['entity.ItemFrame.name'/57826, l='MpServer', x=-16.50, y=74.50, z=227.06], rn['Bat'/57824, l='MpServer', x=-28.75, y=59.10, z=223.47], rn['Bat'/65575, l='MpServer', x=-70.25, y=13.10, z=157.44], rn['Bat'/65573, l='MpServer', x=-55.25, y=15.10, z=172.50], tv['Zombie'/66929, l='MpServer', x=5.50, y=32.00, z=196.50], tv['Zombie'/66930, l='MpServer', x=6.50, y=32.00, z=197.50], sr['item.item.egg'/62361, l='MpServer', x=-57.53, y=18.13, z=173.72], tv['Zombie'/66413, l='MpServer', x=-106.69, y=43.00, z=185.66], te['Creeper'/66842, l='MpServer', x=-102.50, y=43.00, z=188.50], tv['Zombie'/66843, l='MpServer', x=-104.50, y=43.00, z=187.50], tv['Zombie'/66417, l='MpServer', x=-100.47, y=43.00, z=189.69], te['Creeper'/66418, l='MpServer', x=-108.50, y=57.00, z=180.50], te['Creeper'/66841, l='MpServer', x=-109.13, y=41.00, z=182.84], te['Creeper'/66623, l='MpServer', x=-122.50, y=29.00, z=188.50], tv['Zombie'/65662, l='MpServer', x=25.34, y=36.00, z=177.22], tv['Zombie'/65663, l='MpServer', x=29.47, y=36.00, z=173.00], od['entity.LeashKnot.name'/57994, l='MpServer', x=-12.50, y=80.50, z=216.50], tq['Skeleton'/66605, l='MpServer', x=22.50, y=45.00, z=199.50], te['Creeper'/66127, l='MpServer', x=6.50, y=63.00, z=225.50], te['Creeper'/66126, l='MpServer', x=6.75, y=59.00, z=229.50], te['Creeper'/67014, l='MpServer', x=-112.50, y=34.00, z=185.50], tq['Skeleton'/67015, l='MpServer', x=-112.50, y=34.00, z=187.50], te['Creeper'/64700, l='MpServer', x=-36.31, y=61.00, z=251.31], sr['item.item.rottenFlesh'/65691, l='MpServer', x=-106.78, y=70.13, z=285.34], tq['Skeleton'/64940, l='MpServer', x=27.91, y=94.00, z=269.50], ok['Painting'/178, l='MpServer', x=-65.00, y=55.50, z=224.94], te['Creeper'/67013, l='MpServer', x=-115.50, y=34.00, z=186.50], rp['Chicken'/141, l='MpServer', x=-124.38, y=76.00, z=284.56], ts['Spider'/65422, l='MpServer', x=-102.19, y=43.00, z=282.59], te['Creeper'/64699, l='MpServer', x=-36.75, y=61.00, z=252.16], rn['Bat'/66229, l='MpServer', x=-116.76, y=25.74, z=176.79], tq['Skeleton'/67016, l='MpServer', x=-109.50, y=34.00, z=186.50], rn['Bat'/67031, l='MpServer', x=14.72, y=61.00, z=223.79], tq['Skeleton'/65664, l='MpServer', x=23.47, y=35.00, z=165.88], ts['Spider'/66760, l='MpServer', x=22.00, y=48.97, z=173.28], te['Creeper'/64947, l='MpServer', x=-3.50, y=115.00, z=240.50], ts['Spider'/64945, l='MpServer', x=-39.50, y=71.00, z=265.50], rx['Pig'/171, l='MpServer', x=-66.31, y=64.00, z=194.50], rx['Pig'/170, l='MpServer', x=-68.31, y=67.00, z=154.53], oc['entity.ItemFrame.name'/175, l='MpServer', x=-65.50, y=55.50, z=220.06], oc['entity.ItemFrame.name'/174, l='MpServer', x=-66.50, y=54.50, z=220.06], oc['entity.ItemFrame.name'/173, l='MpServer', x=-65.94, y=55.50, z=214.50], oc['entity.ItemFrame.name'/172, l='MpServer', x=-65.94, y=55.50, z=216.50], rp['Chicken'/163, l='MpServer', x=-79.59, y=10.00, z=214.59], rn['Bat'/65200, l='MpServer', x=-95.56, y=22.77, z=174.41], rp['Chicken'/162, l='MpServer', x=-76.59, y=14.00, z=177.47], tq['Skeleton'/66193, l='MpServer', x=-116.50, y=35.00, z=189.50], tq['Skeleton'/65204, l='MpServer', x=13.50, y=60.00, z=233.50], rn['Bat'/66790, l='MpServer', x=-35.28, y=12.81, z=280.57], se['Luigi'/186, l='MpServer', x=-59.31, y=68.00, z=233.78], se['Peach'/187, l='MpServer', x=-62.56, y=70.00, z=235.69], oc['entity.ItemFrame.name'/184, l='MpServer', x=-63.50, y=55.50, z=212.06], oc['entity.ItemFrame.name'/185, l='MpServer', x=-63.50, y=55.50, z=218.94], se['Luigi'/190, l='MpServer', x=-60.22, y=70.00, z=231.31], se['Mario'/188, l='MpServer', x=-60.84, y=70.00, z=235.69], se['Daisy'/189, l='MpServer', x=-62.50, y=70.00, z=231.31], sr['item.item.rottenFlesh'/65698, l='MpServer', x=-67.22, y=104.13, z=218.03], ok['Painting'/178, l='MpServer', x=-65.00, y=55.50, z=224.94], sr['item.item.arrow'/65696, l='MpServer', x=-89.22, y=69.13, z=260.63], oc['entity.ItemFrame.name'/176, l='MpServer', x=-65.50, y=54.50, z=220.06], sr['item.item.bone'/65697, l='MpServer', x=-89.22, y=69.13, z=260.59], oc['entity.ItemFrame.name'/177, l='MpServer', x=-66.94, y=55.50, z=222.50], oc['entity.ItemFrame.name'/182, l='MpServer', x=-59.06, y=55.50, z=215.50], oc['entity.ItemFrame.name'/183, l='MpServer', x=-61.50, y=55.50, z=218.94], rp['Chicken'/180, l='MpServer', x=-56.66, y=18.00, z=173.53], oc['entity.ItemFrame.name'/201, l='MpServer', x=-40.94, y=57.50, z=230.50], oc['entity.ItemFrame.name'/200, l='MpServer', x=-39.06, y=57.50, z=224.50], oc['entity.ItemFrame.name'/202, l='MpServer', x=-40.94, y=57.50, z=231.50], ry['Sheep'/57888, l='MpServer', x=14.22, y=76.00, z=226.16], oc['entity.ItemFrame.name'/197, l='MpServer', x=-39.06, y=56.50, z=229.50], ry['Sheep'/57889, l='MpServer', x=15.50, y=76.00, z=226.09], oc['entity.ItemFrame.name'/196, l='MpServer', x=-39.06, y=57.50, z=227.50], sr['item.item.rottenFlesh'/65751, l='MpServer', x=-50.78, y=108.13, z=196.38], te['Creeper'/65237, l='MpServer', x=-97.50, y=67.00, z=255.50], oc['entity.ItemFrame.name'/199, l='MpServer', x=-39.06, y=57.50, z=231.50], oc['entity.ItemFrame.name'/198, l='MpServer', x=-39.06, y=54.50, z=229.50], tv['Zombie'/63322, l='MpServer', x=-53.50, y=69.00, z=231.50], oc['entity.ItemFrame.name'/195, l='MpServer', x=-39.06, y=56.50, z=226.50], oc['entity.ItemFrame.name'/194, l='MpServer', x=-39.06, y=54.50, z=226.50], ry['Sheep'/57913, l='MpServer', x=20.53, y=76.00, z=226.75], rn['Bat'/65500, l='MpServer', x=-111.66, y=37.24, z=188.69], ry['Sheep'/57912, l='MpServer', x=19.38, y=76.00, z=227.53], rx['Pig'/57914, l='MpServer', x=22.81, y=94.00, z=270.34], tv['Zombie'/66011, l='MpServer', x=-121.50, y=29.00, z=188.50], tv['Zombie'/66286, l='MpServer', x=-122.50, y=42.00, z=224.50], rx['Pig'/57916, l='MpServer', x=19.47, y=97.00, z=298.88], tq['Skeleton'/66287, l='MpServer', x=-119.50, y=42.00, z=221.50], tv['Zombie'/66010, l='MpServer', x=-110.50, y=25.00, z=187.31], te['Creeper'/64736, l='MpServer', x=-107.50, y=67.00, z=197.50], ts['Spider'/65733, l='MpServer', x=9.50, y=37.00, z=284.50], tq['Skeleton'/65015, l='MpServer', x=-122.50, y=65.00, z=150.09], ry['Sheep'/57911, l='MpServer', x=18.16, y=76.00, z=221.06], tv['Zombie'/65731, l='MpServer', x=12.50, y=37.00, z=289.50], ry['Sheep'/57910, l='MpServer', x=19.41, y=76.00, z=221.44], tq['Skeleton'/66738, l='MpServer', x=26.22, y=51.00, z=199.31], tq['Skeleton'/66271, l='MpServer', x=26.50, y=61.00, z=201.50], rx['Pig'/57869, l='MpServer', x=7.28, y=76.00, z=175.06], rq['Cow'/57856, l='MpServer', x=-4.91, y=72.00, z=221.13], rq['Cow'/57857, l='MpServer', x=-8.84, y=72.00, z=220.50], ry['Sheep'/57883, l='MpServer', x=11.50, y=76.00, z=226.09], ry['Sheep'/57887, l='MpServer', x=3.78, y=76.00, z=227.38], ry['Sheep'/57886, l='MpServer', x=6.16, y=76.00, z=226.50], ry['Sheep'/57885, l='MpServer', x=8.13, y=76.00, z=227.06], ry['Sheep'/57884, l='MpServer', x=12.25, y=76.00, z=227.34], ry['Sheep'/57875, l='MpServer', x=10.59, y=76.00, z=220.50], ry['Sheep'/57874, l='MpServer', x=7.22, y=76.00, z=221.41], ry['Sheep'/57873, l='MpServer', x=3.94, y=76.00, z=221.84], ry['Sheep'/57879, l='MpServer', x=15.19, y=76.00, z=220.53], ry['Sheep'/57878, l='MpServer', x=12.53, y=76.00, z=221.84], ry['Sheep'/57877, l='MpServer', x=2.50, y=76.00, z=220.56], ry['Sheep'/57876, l='MpServer', x=11.94, y=76.00, z=220.66]]
Retry entities: 0 total; []
Server brand: vanilla
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: 33453136 bytes (31 MB) / 227336192 bytes (216 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 13147 (736232 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Launched Version: 1.6.2
LWJGL: 2.9.0
OpenGL: Intel HD Graphics 3000 OpenGL Engine GL version 2.1 INTEL-8.12.47, Intel Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Pack: Sphax PureBDcraft 128x MC15
Current Language: English (UK)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1893 (106008 bytes; 0 MB) allocated, 17 (952 bytes; 0 MB) used