When I'm digging and my tool breaks the game crashes. When I restart the game I still have my tool and if I use it, it breaks and the game crashes

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 12/2/15 8:21 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bkg.a(SourceFile:142)
at bkg.b(SourceFile:247)
at bbz.b(SourceFile:1345)
at bbz.ax(SourceFile:1945)
at bbz.aw(SourceFile:1752)
at bbz.s(SourceFile:1596)
at bbz.as(SourceFile:942)
at bbz.a(SourceFile:386)
at net.minecraft.client.main.Main.main(SourceFile:122)

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

– Head –
Stacktrace:
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bkg.a(SourceFile:142)
at bkg.b(SourceFile:247)
at bbz.b(SourceFile:1345)
at bbz.ax(SourceFile:1945)
at bbz.aw(SourceFile:1752)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bmg['JRSofty'/251, l='MpServer', x=292.51, y=5.00, z=339.70]]
Chunk stats: MultiplayerChunkCache: 625, 625
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (192,64,252), Chunk: (at 0,4,12 in 12,15; contains blocks 192,0,240 to 207,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1023917 game time, 1375002 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: 108 total; [zf['Zombie'/23, l='MpServer', x=215.06, y=39.00, z=357.44], vq['Bat'/24, l='MpServer', x=218.89, y=35.59, z=347.29], zf['Zombie'/35, l='MpServer', x=224.50, y=14.00, z=296.50], wc['Squid'/36, l='MpServer', x=227.72, y=56.81, z=290.47], wc['Squid'/37, l='MpServer', x=234.34, y=57.16, z=290.09], wc['Squid'/38, l='MpServer', x=232.94, y=54.84, z=288.22], wc['Squid'/39, l='MpServer', x=233.69, y=53.97, z=287.72], yn['Creeper'/40, l='MpServer', x=234.50, y=31.00, z=347.50], yn['Creeper'/41, l='MpServer', x=238.50, y=31.00, z=348.50], zf['Zombie'/42, l='MpServer', x=228.50, y=32.00, z=345.50], wc['Squid'/53, l='MpServer', x=248.69, y=62.56, z=291.75], wc['Squid'/54, l='MpServer', x=243.97, y=55.09, z=296.53], wc['Squid'/55, l='MpServer', x=248.06, y=56.47, z=293.19], zd['Spider'/56, l='MpServer', x=240.50, y=61.00, z=360.50], vy['Pig'/68, l='MpServer', x=256.50, y=62.22, z=274.19], wa['Sheep'/69, l='MpServer', x=270.31, y=64.00, z=285.53], zb['Skeleton'/70, l='MpServer', x=263.50, y=43.00, z=336.50], zb['Skeleton'/71, l='MpServer', x=267.50, y=43.00, z=337.50], bmg['JRSofty'/251, l='MpServer', x=292.51, y=5.00, z=339.70], vy['Pig'/88, l='MpServer', x=285.00, y=66.00, z=304.97], vy['Pig'/89, l='MpServer', x=272.41, y=63.92, z=305.13], yn['Creeper'/102, l='MpServer', x=299.50, y=36.00, z=282.50], yn['Creeper'/103, l='MpServer', x=298.50, y=36.00, z=282.50], yn['Creeper'/104, l='MpServer', x=298.50, y=36.00, z=279.50], zb['Skeleton'/105, l='MpServer', x=299.81, y=36.00, z=284.50], zb['Skeleton'/106, l='MpServer', x=299.50, y=56.00, z=272.50], zb['Skeleton'/107, l='MpServer', x=299.50, y=36.00, z=290.50], zf['Zombie'/108, l='MpServer', x=298.91, y=36.00, z=289.38], wa['Sheep'/109, l='MpServer', x=297.41, y=66.00, z=311.78], yn['Creeper'/113, l='MpServer', x=300.50, y=46.00, z=383.50], yn['Creeper'/114, l='MpServer', x=299.50, y=46.00, z=385.50], yn['Creeper'/115, l='MpServer', x=302.50, y=55.00, z=409.50], yn['Creeper'/122, l='MpServer', x=307.50, y=14.00, z=267.50], yb['container.minecart'/123, l='MpServer', x=313.50, y=24.06, z=274.50], zb['Skeleton'/124, l='MpServer', x=306.56, y=57.00, z=288.81], zb['Skeleton'/125, l='MpServer', x=314.03, y=55.00, z=298.53], vq['Bat'/126, l='MpServer', x=317.25, y=47.09, z=304.47], vq['Bat'/127, l='MpServer', x=318.61, y=51.77, z=301.04], wa['Sheep'/128, l='MpServer', x=312.13, y=68.00, z=294.94], vq['Bat'/129, l='MpServer', x=317.36, y=42.00, z=311.73], yn['Creeper'/130, l='MpServer', x=311.78, y=45.00, z=306.50], zf['Zombie'/131, l='MpServer', x=309.91, y=46.00, z=307.47], vq['Bat'/132, l='MpServer', x=327.29, y=43.19, z=312.20], vq['Bat'/133, l='MpServer', x=329.25, y=46.09, z=306.55], wa['Sheep'/134, l='MpServer', x=306.19, y=67.00, z=337.50], vq['Bat'/135, l='MpServer', x=317.45, y=53.54, z=402.41], wa['Sheep'/136, l='MpServer', x=317.66, y=76.00, z=386.22], yn['Creeper'/137, l='MpServer', x=310.50, y=58.00, z=400.50], zf['Zombie'/138, l='MpServer', x=307.88, y=54.00, z=405.44], zb['Skeleton'/148, l='MpServer', x=333.50, y=51.00, z=286.50], zb['Skeleton'/149, l='MpServer', x=328.50, y=54.00, z=292.50], zb['Skeleton'/150, l='MpServer', x=323.50, y=50.00, z=299.50], zb['Skeleton'/151, l='MpServer', x=326.13, y=49.00, z=300.50], zb['Skeleton'/152, l='MpServer', x=320.69, y=50.00, z=303.50], zb['Skeleton'/153, l='MpServer', x=321.72, y=50.00, z=303.50], yb['container.minecart'/154, l='MpServer', x=326.44, y=33.00, z=306.16], yn['Creeper'/155, l='MpServer', x=328.50, y=42.00, z=309.50], vq['Bat'/156, l='MpServer', x=330.16, y=45.67, z=309.50], vq['Bat'/157, l='MpServer', x=335.70, y=43.60, z=306.46], wa['Sheep'/158, l='MpServer', x=322.19, y=66.00, z=319.97], wa['Sheep'/159, l='MpServer', x=331.50, y=63.59, z=322.44], wa['Sheep'/160, l='MpServer', x=332.41, y=63.09, z=323.44], wa['Sheep'/161, l='MpServer', x=326.63, y=69.00, z=372.47], zb['Skeleton'/162, l='MpServer', x=320.50, y=51.00, z=394.50], wa['Sheep'/163, l='MpServer', x=331.09, y=76.00, z=399.53], yo['Enderman'/164, l='MpServer', x=320.50, y=14.00, z=402.50], vq['Bat'/165, l='MpServer', x=321.69, y=47.10, z=400.41], vq['Bat'/166, l='MpServer', x=325.65, y=39.17, z=396.80], vt['Chicken'/167, l='MpServer', x=335.47, y=77.00, z=406.72], yn['Creeper'/177, l='MpServer', x=345.50, y=51.00, z=266.50], zf['Zombie'/178, l='MpServer', x=343.53, y=51.00, z=273.03], yn['Creeper'/179, l='MpServer', x=348.50, y=45.00, z=284.50], zb['Skeleton'/180, l='MpServer', x=350.47, y=44.00, z=276.81], zb['Skeleton'/181, l='MpServer', x=349.56, y=45.00, z=282.78], zb['Skeleton'/182, l='MpServer', x=350.09, y=45.00, z=280.56], zf['Zombie'/183, l='MpServer', x=346.50, y=46.00, z=285.91], zf['Zombie'/184, l='MpServer', x=340.50, y=53.00, z=276.03], vq['Bat'/185, l='MpServer', x=338.25, y=53.73, z=276.75], zf['Zombie'/186, l='MpServer', x=352.75, y=48.94, z=296.78], zf['Zombie'/187, l='MpServer', x=339.50, y=51.00, z=292.50], zb['Skeleton'/188, l='MpServer', x=343.91, y=50.00, z=289.91], zb['Skeleton'/189, l='MpServer', x=344.50, y=52.00, z=301.50], zf['Zombie'/190, l='MpServer', x=344.19, y=50.00, z=290.75], zb['Skeleton'/191, l='MpServer', x=344.72, y=50.00, z=291.19], yn['Creeper'/192, l='MpServer', x=341.50, y=51.00, z=288.50], yn['Creeper'/193, l='MpServer', x=341.50, y=51.00, z=288.50], vq['Bat'/194, l='MpServer', x=347.54, y=49.76, z=290.70], vq['Bat'/195, l='MpServer', x=342.29, y=51.15, z=288.82], zb['Skeleton'/196, l='MpServer', x=337.28, y=55.00, z=311.31], zd['Spider'/197, l='MpServer', x=352.50, y=48.97, z=295.03], zb['Skeleton'/198, l='MpServer', x=345.50, y=9.00, z=321.50], vy['Pig'/199, l='MpServer', x=347.50, y=67.00, z=354.13], zf['Zombie'/200, l='MpServer', x=350.34, y=42.00, z=399.28], wa['Sheep'/201, l='MpServer', x=346.91, y=68.00, z=387.50], yn['Creeper'/202, l='MpServer', x=350.16, y=42.00, z=400.63], zf['Zombie'/203, l='MpServer', x=345.94, y=41.00, z=398.50], yb['container.minecart'/218, l='MpServer', x=358.50, y=42.06, z=258.50], wa['Sheep'/219, l='MpServer', x=365.34, y=79.00, z=292.22], wa['Sheep'/220, l='MpServer', x=363.75, y=67.00, z=344.16], wa['Sheep'/221, l='MpServer', x=357.19, y=77.00, z=393.16], xz['item.tile.stone.granite'/487, l='MpServer', x=292.72, y=5.00, z=341.81], xz['item.tile.stone.granite'/489, l='MpServer', x=292.69, y=5.00, z=342.75], xz['item.tile.stonebrick'/491, l='MpServer', x=292.50, y=6.00, z=343.78], xz['item.tile.stonebrick'/493, l='MpServer', x=292.38, y=6.00, z=344.88], zf['Zombie'/238, l='MpServer', x=368.50, y=36.00, z=318.50], wa['Sheep'/239, l='MpServer', x=372.47, y=72.00, z=314.72], xz['item.tile.stonebrick'/497, l='MpServer', x=292.72, y=5.00, z=341.88], xz['item.tile.stonebrick'/499, l='MpServer', x=292.88, y=5.00, z=342.07]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bkh.a(SourceFile:364)
at bbz.b(SourceFile:2496)
at bbz.a(SourceFile:400)
at net.minecraft.client.main.Main.main(SourceFile:122)

– System Details –
Details:
Minecraft Version: 15w49a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 173360552 bytes (165 MB) / 407425024 bytes (388 MB) up to 2134114304 bytes (2035 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 15w49a
LWJGL: 2.9.4
OpenGL: Radeon HD 6470M GL version 4.1.10524 Compatibility Profile Context, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: Faithful 1.9 - 15w44b.zip
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz