Crash when expanding map in crafting table.

Put paper around a map in crafting table (2 in each slot) to expand a map, and after taking the expanded map from the output back into the recipe (to make an even larger map). Client immediately crashed after taking the map from the output the second time.

What I expected to happen was...:
Expand map twice.

What actually happened was...:
Game crashed

Steps to Reproduce:
1. Place a map in center crafting table grid, and surround it with paper (with 2 pieces of paper in each grid space)
2. Take expanded map from output, and put it back in the center crafting table grid.
3. Take the map from output again and boom crash

Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 7/20/13 5:56 PM
Description: Updating screen events

java.lang.NullPointerException
at yg.d(SourceFile:235)
at yd.a(SourceFile:324)
at wc.b(SourceFile:41)
at wc.a(SourceFile:58)
at ux.a(SourceFile:239)
at bcz.a(SourceFile:295)
at awv.a(SourceFile:582)
at awv.a(SourceFile:410)
at awb.d(SourceFile:128)
at awb.m(SourceFile:107)
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 yg.d(SourceFile:235)
at yd.a(SourceFile:324)
at wc.b(SourceFile:41)
at wc.a(SourceFile:58)
at ux.a(SourceFile:239)
at bcz.a(SourceFile:295)
at awv.a(SourceFile:582)
at awv.a(SourceFile:410)
at awb.d(SourceFile:128)
at awb.m(SourceFile:107)

– Affected screen –
Details:
Screen name: axh

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdf['Capt_Banana'/416, l='MpServer', x=404.31, y=64.62, z=297.10]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (220,64,236), Chunk: (at 12,4,12 in 13,14; contains blocks 208,0,224 to 223,255,239), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 596460 game time, 596460 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: 56 total; [rn['Bat'/3406, l='MpServer', x=364.57, y=18.82, z=277.56], bdf['Capt_Banana'/416, l='MpServer', x=404.31, y=64.62, z=297.10], rn['Bat'/3405, l='MpServer', x=368.44, y=18.79, z=276.25], sr['item.tile.stonebrick'/2447, l='MpServer', x=469.34, y=12.13, z=246.97], tq['Skeleton'/3292, l='MpServer', x=463.50, y=64.00, z=250.50], rn['Bat'/2982, l='MpServer', x=386.88, y=43.10, z=303.72], sr['item.item.egg'/2319, l='MpServer', x=378.88, y=63.13, z=343.34], tv['Zombie'/3290, l='MpServer', x=346.50, y=33.00, z=226.50], tq['Skeleton'/3155, l='MpServer', x=363.50, y=27.00, z=272.50], tq['Skeleton'/3154, l='MpServer', x=364.50, y=27.00, z=270.50], tq['Skeleton'/3271, l='MpServer', x=470.50, y=64.00, z=273.50], tq['Skeleton'/3006, l='MpServer', x=366.50, y=27.00, z=275.50], tq['Skeleton'/2724, l='MpServer', x=418.50, y=65.00, z=247.50], rn['Bat'/3408, l='MpServer', x=365.85, y=18.77, z=279.71], se['Wolf'/440, l='MpServer', x=412.09, y=63.00, z=222.91], se['Wolf'/441, l='MpServer', x=413.16, y=63.00, z=223.97], te['Creeper'/3194, l='MpServer', x=369.50, y=22.00, z=268.50], tv['Zombie'/3192, l='MpServer', x=334.50, y=42.00, z=289.50], se['Wolf'/447, l='MpServer', x=411.03, y=63.00, z=297.44], te['Creeper'/2828, l='MpServer', x=475.50, y=24.00, z=328.50], se['Wolf'/439, l='MpServer', x=409.97, y=63.00, z=287.31], tv['Zombie'/425, l='MpServer', x=416.62, y=17.05, z=265.70], rn['Bat'/3300, l='MpServer', x=359.88, y=25.48, z=313.62], ts['Spider'/3171, l='MpServer', x=349.81, y=41.00, z=262.19], tq['Skeleton'/3169, l='MpServer', x=349.50, y=41.00, z=264.50], tv['Zombie'/3218, l='MpServer', x=362.50, y=43.00, z=246.50], te['Creeper'/3220, l='MpServer', x=336.50, y=26.00, z=353.50], tq['Skeleton'/3053, l='MpServer', x=338.47, y=21.00, z=238.94], tq['Skeleton'/3055, l='MpServer', x=342.44, y=27.00, z=242.56], rn['Bat'/3223, l='MpServer', x=384.31, y=39.05, z=287.26], tq['Skeleton'/3054, l='MpServer', x=343.44, y=27.00, z=242.03], tq['Skeleton'/3332, l='MpServer', x=347.50, y=43.00, z=325.50], tq['Skeleton'/3333, l='MpServer', x=355.34, y=42.00, z=330.16], te['Creeper'/3201, l='MpServer', x=341.50, y=31.00, z=260.50], sr['item.tile.stonebrick'/2659, l='MpServer', x=454.19, y=11.13, z=243.78], tv['Zombie'/3202, l='MpServer', x=340.69, y=27.83, z=250.31], sr['item.tile.stonebrick'/2663, l='MpServer', x=453.13, y=11.13, z=245.09], sr['item.tile.stonebrick'/2661, l='MpServer', x=454.88, y=10.13, z=244.88], tv['Zombie'/3346, l='MpServer', x=362.59, y=30.00, z=268.07], tv['Zombie'/3058, l='MpServer', x=377.50, y=15.00, z=286.50], tq['Skeleton'/3349, l='MpServer', x=430.50, y=17.00, z=360.50], tq['Skeleton'/2778, l='MpServer', x=352.47, y=27.00, z=303.88], rp['Chicken'/511, l='MpServer', x=376.50, y=63.00, z=343.50], tv['Zombie'/3361, l='MpServer', x=465.50, y=39.00, z=321.50], te['Creeper'/3125, l='MpServer', x=375.50, y=21.00, z=298.50], rn['Bat'/3235, l='MpServer', x=341.57, y=26.78, z=316.76], st['entity.MinecartChest.name'/255, l='MpServer', x=345.75, y=26.34, z=231.50], tq['Skeleton'/2762, l='MpServer', x=369.50, y=16.00, z=315.50], tv['Zombie'/3388, l='MpServer', x=369.50, y=15.00, z=298.50], rn['Bat'/3238, l='MpServer', x=356.49, y=25.06, z=313.78], tv['Zombie'/3107, l='MpServer', x=366.50, y=21.00, z=299.50], tv['Zombie'/3246, l='MpServer', x=377.50, y=15.00, z=317.50], te['Creeper'/3383, l='MpServer', x=382.50, y=35.00, z=236.50], te['Creeper'/3245, l='MpServer', x=373.50, y=15.00, z=311.50], te['Creeper'/3108, l='MpServer', x=371.22, y=19.00, z=309.16], tq['Skeleton'/3382, l='MpServer', x=369.50, y=32.00, z=249.50]]
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: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_10, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 219951136 bytes (209 MB) / 410910720 bytes (391 MB) up to 954466304 bytes (910 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 1192 (66752 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: AMD Radeon HD 6700 Series GL version 4.2.12002 Compatibility Profile Context 9.12.0.0, 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: 184 (10304 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used