Doing nothing in particular, selecting tools/weapons, looking at who's online using Tab.

---- Minecraft Crash Report ----
// There are four lights!

Time: 12/28/13 6:19 PM
Description: Updating screen events

java.lang.IndexOutOfBoundsException: Index: 61, Size: 45
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at yj.a(SourceFile:281)
at bjz.a(SourceFile:308)
at bdn.a(SourceFile:490)
at bdn.a(SourceFile:514)
at bdn.a(SourceFile:499)
at bcl.l(SourceFile:245)
at bcl.k(SourceFile:217)
at azi.p(SourceFile:1308)
at azi.ah(SourceFile:760)
at azi.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:152)

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

– Head –
Stacktrace:
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at yj.a(SourceFile:281)
at bjz.a(SourceFile:308)
at bdn.a(SourceFile:490)
at bdn.a(SourceFile:514)
at bdn.a(SourceFile:499)
at bcl.l(SourceFile:245)
at bcl.k(SourceFile:217)

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

– Affected level –
Details:
Level name: MpServer
All players: 2 total; [bkf['zltippett'/196001, l='MpServer', x=2683.87, y=90.62, z=2921.17], bme['sweetness_tina'/193535, l='MpServer', x=2701.22, y=89.00, z=2924.93]]
Chunk stats: MultiplayerChunkCache: 441, 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-4,64,-80), Chunk: (at 12,4,0 in -1,-5; contains blocks -16,0,-80 to -1,255,-65), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 35187847 game time, 40809546 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: 116 total; [bkf['zltippett'/196001, l='MpServer', x=2683.87, y=90.62, z=2921.17], wq['Creeper'/234823, l='MpServer', x=2607.00, y=56.00, z=2868.56], xh['Zombie'/232337, l='MpServer', x=2717.50, y=14.00, z=2853.50], vg['Sheep'/193672, l='MpServer', x=2656.44, y=68.00, z=2861.53], wq['Creeper'/234830, l='MpServer', x=2704.50, y=45.00, z=2872.50], bme['sweetness_tina'/193535, l='MpServer', x=2701.22, y=89.00, z=2924.93], xd['Slime'/193667, l='MpServer', x=2670.69, y=29.00, z=2856.31], ux['Chicken'/193693, l='MpServer', x=2703.50, y=29.00, z=2977.50], xh['Zombie'/232086, l='MpServer', x=2707.50, y=58.00, z=2874.50], ux['Chicken'/193691, l='MpServer', x=2695.44, y=12.00, z=2981.56], uv['Bat'/235115, l='MpServer', x=2602.41, y=41.71, z=2918.43], ux['Chicken'/193686, l='MpServer', x=2703.63, y=11.00, z=2859.47], ux['Chicken'/193682, l='MpServer', x=2682.50, y=18.00, z=2865.50], wq['Creeper'/233770, l='MpServer', x=2708.50, y=16.00, z=2970.03], ux['Chicken'/193708, l='MpServer', x=2712.84, y=11.28, z=2957.85], wb['item.item.egg'/233195, l='MpServer', x=2720.31, y=53.13, z=2932.75], ux['Chicken'/193706, l='MpServer', x=2718.16, y=50.00, z=2928.84], xc['Skeleton'/233535, l='MpServer', x=2749.50, y=25.00, z=2906.50], vg['Sheep'/193704, l='MpServer', x=2719.25, y=69.00, z=2864.22], wq['Creeper'/233767, l='MpServer', x=2755.50, y=25.00, z=2923.50], ux['Chicken'/193724, l='MpServer', x=2721.22, y=53.00, z=2932.47], vg['Sheep'/193723, l='MpServer', x=2735.47, y=71.00, z=2918.06], vg['Sheep'/193721, l='MpServer', x=2728.22, y=70.00, z=2891.19], ux['Chicken'/193719, l='MpServer', x=2734.50, y=23.00, z=2899.50], uv['Bat'/235083, l='MpServer', x=2712.66, y=15.45, z=2854.34], vg['Sheep'/193718, l='MpServer', x=2720.94, y=69.00, z=2866.91], vg['Sheep'/193717, l='MpServer', x=2731.53, y=69.00, z=2849.66], xh['Zombie'/233776, l='MpServer', x=2614.50, y=38.00, z=2988.50], vg['Sheep'/193716, l='MpServer', x=2729.13, y=69.00, z=2848.88], xc['Skeleton'/234875, l='MpServer', x=2744.50, y=22.00, z=2848.50], ux['Chicken'/193715, l='MpServer', x=2739.25, y=24.00, z=2860.84], ux['Chicken'/193713, l='MpServer', x=2731.44, y=21.00, z=2846.38], vg['Sheep'/193743, l='MpServer', x=2753.66, y=70.00, z=2873.47], xc['Skeleton'/233559, l='MpServer', x=2731.50, y=34.00, z=2944.50], ux['Chicken'/193729, l='MpServer', x=2729.34, y=51.00, z=2955.34], xh['Zombie'/235071, l='MpServer', x=2653.00, y=19.00, z=2848.25], xe['Spider'/235070, l='MpServer', x=2654.28, y=19.00, z=2848.28], bme['sweetness_tina'/193535, l='MpServer', x=2701.22, y=89.00, z=2924.93], ux['Chicken'/193732, l='MpServer', x=2738.41, y=29.00, z=2910.59], xe['Spider'/235045, l='MpServer', x=2648.50, y=47.00, z=2847.09], wb['item.item.egg'/230917, l='MpServer', x=2681.84, y=18.13, z=2864.19], xh['Zombie'/235047, l='MpServer', x=2648.50, y=47.00, z=2848.97], xc['Skeleton'/234502, l='MpServer', x=2739.50, y=52.00, z=2943.50], xc['Skeleton'/234503, l='MpServer', x=2740.50, y=52.00, z=2941.50], xc['Skeleton'/234500, l='MpServer', x=2741.50, y=52.00, z=2941.50], xc['Skeleton'/234501, l='MpServer', x=2741.50, y=52.00, z=2944.50], xc['Skeleton'/232866, l='MpServer', x=2753.50, y=25.00, z=2930.69], ux['Chicken'/193744, l='MpServer', x=2755.16, y=38.93, z=2910.15], ux['Chicken'/193747, l='MpServer', x=2759.13, y=11.00, z=2934.84], uv['Bat'/235325, l='MpServer', x=2700.06, y=18.14, z=2969.47], vg['Sheep'/193746, l='MpServer', x=2757.91, y=71.00, z=2904.19], uv['Bat'/235324, l='MpServer', x=2700.66, y=20.35, z=2971.41], vg['Sheep'/193749, l='MpServer', x=2754.66, y=72.00, z=2933.75], wq['Creeper'/234783, l='MpServer', x=2685.50, y=49.00, z=2852.50], xh['Zombie'/233347, l='MpServer', x=2604.50, y=22.00, z=2940.50], uv['Bat'/233133, l='MpServer', x=2750.06, y=16.94, z=2883.33], uv['Bat'/235028, l='MpServer', x=2668.33, y=14.75, z=2851.19], uv['Bat'/234790, l='MpServer', x=2722.45, y=12.44, z=2876.04], uv['Bat'/234794, l='MpServer', x=2693.21, y=39.95, z=2852.60], wq['Creeper'/234067, l='MpServer', x=2697.50, y=12.00, z=2973.50], xc['Skeleton'/234065, l='MpServer', x=2697.50, y=12.00, z=2985.50], xh['Zombie'/234307, l='MpServer', x=2692.50, y=48.00, z=2877.50], rl['entity.LeashKnot.name'/193766, l='MpServer', x=2650.50, y=74.50, z=2896.50], rl['entity.LeashKnot.name'/193767, l='MpServer', x=2654.50, y=74.50, z=2902.50], uv['Bat'/234796, l='MpServer', x=2696.49, y=36.55, z=2855.56], uv['Bat'/234802, l='MpServer', x=2613.72, y=20.00, z=2964.69], xh['Zombie'/233387, l='MpServer', x=2720.50, y=15.00, z=2867.50], xh['Zombie'/235008, l='MpServer', x=2649.97, y=19.00, z=2847.69], xh['Zombie'/235292, l='MpServer', x=2635.13, y=36.00, z=2858.38], wb['item.item.egg'/228945, l='MpServer', x=2728.34, y=51.13, z=2955.19], xh['Zombie'/235291, l='MpServer', x=2633.34, y=35.00, z=2858.44], xh['Zombie'/234957, l='MpServer', x=2609.50, y=37.00, z=2930.50], xc['Skeleton'/234956, l='MpServer', x=2659.50, y=48.00, z=2946.50], vj['Squid'/234959, l='MpServer', x=2701.50, y=56.00, z=2873.50], xc['Skeleton'/234955, l='MpServer', x=2663.50, y=18.00, z=2851.50], xh['Zombie'/234954, l='MpServer', x=2669.50, y=18.00, z=2853.50], xc['Skeleton'/235495, l='MpServer', x=2741.50, y=20.00, z=2945.50], xc['Skeleton'/235494, l='MpServer', x=2740.50, y=20.00, z=2945.50], xe['Spider'/235505, l='MpServer', x=2672.50, y=21.00, z=2857.50], vj['Squid'/234960, l='MpServer', x=2700.50, y=56.00, z=2869.63], wb['item.item.egg'/231478, l='MpServer', x=2696.16, y=12.13, z=2983.91], ux['Chicken'/193571, l='MpServer', x=2607.84, y=16.00, z=2933.84], ux['Chicken'/193569, l='MpServer', x=2604.50, y=19.00, z=2917.50], xc['Skeleton'/234983, l='MpServer', x=2616.50, y=22.00, z=2952.50], ux['Chicken'/193577, l='MpServer', x=2606.50, y=38.00, z=2996.50], uv['Bat'/234732, l='MpServer', x=2739.25, y=17.10, z=2847.59], uv['Bat'/234398, l='MpServer', x=2611.94, y=26.23, z=2939.26], uv['Bat'/234392, l='MpServer', x=2613.55, y=21.79, z=2965.47], ux['Chicken'/193605, l='MpServer', x=2615.81, y=18.00, z=2948.19], xd['Slime'/222810, l='MpServer', x=2612.38, y=18.99, z=2940.63], xc['Skeleton'/235195, l='MpServer', x=2609.50, y=48.00, z=2928.50], ux['Chicken'/193606, l='MpServer', x=2611.72, y=18.00, z=2935.63], wq['Creeper'/234472, l='MpServer', x=2763.50, y=25.00, z=2927.50], xh['Zombie'/233693, l='MpServer', x=2699.50, y=36.00, z=2854.50], ux['Chicken'/214064, l='MpServer', x=2665.50, y=22.00, z=2859.50], xc['Skeleton'/233942, l='MpServer', x=2662.41, y=22.00, z=2859.63], ux['Chicken'/193622, l='MpServer', x=2639.16, y=12.09, z=2854.21], ux['Chicken'/193623, l='MpServer', x=2639.16, y=12.13, z=2854.84], ux['Chicken'/193624, l='MpServer', x=2630.85, y=23.13, z=2855.15], ux['Chicken'/193625, l='MpServer', x=2632.34, y=22.00, z=2855.16], ux['Chicken'/193629, l='MpServer', x=2634.19, y=36.00, z=2855.91], ux['Chicken'/193630, l='MpServer', x=2635.41, y=37.00, z=2864.47], wq['Creeper'/234923, l='MpServer', x=2747.83, y=19.00, z=2855.70], xh['Zombie'/234926, l='MpServer', x=2613.50, y=23.00, z=2899.50], xh['Zombie'/234925, l='MpServer', x=2612.50, y=23.00, z=2898.50], xd['Slime'/200504, l='MpServer', x=2668.69, y=12.00, z=2852.44], wq['Creeper'/233966, l='MpServer', x=2737.50, y=25.00, z=2916.50], xd['Slime'/204949, l='MpServer', x=2648.22, y=19.03, z=2844.22], wq['Creeper'/234204, l='MpServer', x=2733.50, y=21.00, z=2854.50], xc['Skeleton'/235418, l='MpServer', x=2669.50, y=29.00, z=2855.50], uz['Horse'/193659, l='MpServer', x=2647.56, y=74.00, z=2898.13], uv['Bat'/235140, l='MpServer', x=2634.46, y=49.33, z=2847.45], xh['Zombie'/234460, l='MpServer', x=2740.50, y=28.00, z=2912.50], xd['Slime'/222819, l='MpServer', x=2667.78, y=16.00, z=2848.22], uv['Bat'/234663, l='MpServer', x=2650.46, y=20.83, z=2845.68], uz['Horse'/193660, l='MpServer', x=2651.75, y=74.00, z=2902.06]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at bka.a(SourceFile:289)
at azi.b(SourceFile:1952)
at azi.f(SourceFile:720)
at net.minecraft.client.main.Main.main(SourceFile:152)

– System Details –
Details:
Minecraft Version: 1.7.4
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_15, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 9598256 bytes (9 MB) / 145620992 bytes (138 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 1932 (108192 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.7.4
LWJGL: 2.9.1
OpenGL: GeForce GTX 660M/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
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)
Vec3 Pool Size: 1960 (109760 bytes; 0 MB) allocated, 22 (1232 bytes; 0 MB) used
Anisotropic Filtering: Off (1)