minecraft has crashed many times

Look i dont know what this means but i think it will help

Level name: MpServer
All players: 1 total; [bdw['superbentley'/323638, l='MpServer', x=68.53, y=65.62, z=293.14]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 189006 game time, 189006 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 83 total; [ru['Creeper'/472145, l='MpServer', x=136.50, y=33.00, z=304.50], ru['Creeper'/472147, l='MpServer', x=141.00, y=35.00, z=314.44], ru['Creeper'/472146, l='MpServer', x=135.50, y=33.00, z=307.50], ru['Creeper'/472148, l='MpServer', x=137.50, y=33.00, z=304.50], sf['Skeleton'/485058, l='MpServer', x=110.09, y=63.00, z=288.50], sf['Skeleton'/391951, l='MpServer', x=121.13, y=69.00, z=342.69], qj['Cow'/323447, l='MpServer', x=-3.50, y=67.00, z=236.31], sj['Zombie'/485063, l='MpServer', x=-6.16, y=20.00, z=304.50], sj['Zombie'/485064, l='MpServer', x=-5.41, y=19.00, z=301.97], sf['Skeleton'/470208, l='MpServer', x=120.22, y=67.00, z=315.69], qr['Squid'/410076, l='MpServer', x=7.19, y=60.09, z=320.44], qr['Squid'/410077, l='MpServer', x=6.47, y=57.28, z=322.19], qr['Squid'/410078, l='MpServer', x=44.53, y=56.34, z=321.91], sj['Zombie'/392261, l='MpServer', x=79.09, y=54.00, z=250.47], qr['Squid'/410075, l='MpServer', x=6.16, y=61.34, z=315.53], qr['Squid'/410066, l='MpServer', x=21.56, y=60.66, z=282.84], sf['Skeleton'/392538, l='MpServer', x=77.50, y=64.00, z=246.50], qr['Squid'/410067, l='MpServer', x=15.59, y=57.34, z=287.22], ru['Creeper'/462215, l='MpServer', x=1.50, y=66.00, z=243.50], sj['Zombie'/392513, l='MpServer', x=1.50, y=65.00, z=253.50], sf['Skeleton'/392515, l='MpServer', x=1.50, y=65.00, z=239.50], ru['Creeper'/462216, l='MpServer', x=-0.50, y=57.00, z=218.50], sf['Skeleton'/469983, l='MpServer', x=101.59, y=61.00, z=231.97], ru['Creeper'/392716, l='MpServer', x=137.50, y=36.00, z=309.50], ru['Creeper'/392717, l='MpServer', x=140.50, y=36.00, z=310.50], ru['Creeper'/470207, l='MpServer', x=117.50, y=67.00, z=326.50], sf['Skeleton'/481216, l='MpServer', x=127.50, y=64.00, z=304.50], sh['Spider'/481219, l='MpServer', x=123.50, y=64.00, z=298.50], sj['Zombie'/392041, l='MpServer', x=136.88, y=32.00, z=321.63], sj['Zombie'/392036, l='MpServer', x=135.50, y=63.00, z=235.50], qj['Cow'/323563, l='MpServer', x=134.50, y=65.00, z=331.72], sh['Spider'/494158, l='MpServer', x=58.41, y=64.00, z=264.93], sh['Spider'/494156, l='MpServer', x=55.38, y=64.00, z=258.84], ru['Creeper'/494155, l='MpServer', x=55.50, y=64.00, z=269.50], qj['Cow'/323567, l='MpServer', x=134.75, y=67.00, z=342.63], qj['Cow'/323566, l='MpServer', x=132.50, y=68.00, z=337.50], ru['Creeper'/494153, l='MpServer', x=56.50, y=64.00, z=264.50], qj['Cow'/323564, l='MpServer', x=129.47, y=69.00, z=335.28], qg['Bat'/425180, l='MpServer', x=107.38, y=34.10, z=339.25], qj['Cow'/323552, l='MpServer', x=128.50, y=64.00, z=277.47], qg['Bat'/474994, l='MpServer', x=141.07, y=17.73, z=337.14], ru['Creeper'/392682, l='MpServer', x=150.50, y=24.00, z=363.50], sf['Skeleton'/392681, l='MpServer', x=144.69, y=24.00, z=366.50], qg['Bat'/496774, l='MpServer', x=128.00, y=22.17, z=366.59], sf['Skeleton'/392438, l='MpServer', x=-5.31, y=20.00, z=304.50], qg['Bat'/496772, l='MpServer', x=145.94, y=31.00, z=354.34], sf['Skeleton'/392672, l='MpServer', x=91.50, y=63.00, z=215.50], sf['Skeleton'/392669, l='MpServer', x=93.50, y=63.00, z=218.50], sf['Skeleton'/392670, l='MpServer', x=94.50, y=63.00, z=217.50], qj['Cow'/323533, l='MpServer', x=126.50, y=63.00, z=277.50], qj['Cow'/323532, l='MpServer', x=110.50, y=66.00, z=266.25], bdw['superbentley'/323638, l='MpServer', x=68.53, y=65.62, z=293.14], qj['Cow'/323523, l='MpServer', x=96.09, y=64.00, z=319.91], qj['Cow'/323524, l='MpServer', x=118.63, y=70.00, z=340.41], qj['Cow'/323551, l='MpServer', x=128.50, y=64.00, z=278.53], qj['Cow'/323540, l='MpServer', x=115.25, y=68.00, z=322.25], qj['Cow'/323541, l='MpServer', x=115.25, y=68.00, z=327.34], ru['Creeper'/392361, l='MpServer', x=137.03, y=55.00, z=314.53], ru['Creeper'/392145, l='MpServer', x=41.50, y=61.00, z=260.94], ru['Creeper'/392146, l='MpServer', x=67.09, y=64.00, z=284.25], qg['Bat'/323501, l='MpServer', x=69.75, y=58.10, z=267.25], sh['Spider'/509283, l='MpServer', x=145.50, y=48.00, z=350.50], sj['Zombie'/392148, l='MpServer', x=51.50, y=54.00, z=267.03], ru['Creeper'/509282, l='MpServer', x=146.50, y=48.00, z=347.50], sj['Zombie'/392151, l='MpServer', x=50.72, y=64.00, z=279.09], qg['Bat'/391876, l='MpServer', x=6.75, y=33.10, z=356.50], rh['item.item.seeds'/323495, l='MpServer', x=57.63, y=62.13, z=298.72], rh['item.item.seeds'/323494, l='MpServer', x=58.97, y=64.13, z=280.66], qr['Squid'/323506, l='MpServer', x=60.48, y=50.18, z=309.06], ru['Creeper'/392332, l='MpServer', x=142.06, y=27.00, z=348.69], qj['Cow'/323461, l='MpServer', x=25.22, y=63.00, z=263.72], sf['Skeleton'/391913, l='MpServer', x=6.94, y=63.00, z=260.50], ru['Creeper'/517934, l='MpServer', x=-11.50, y=33.00, z=354.50], sf['Skeleton'/392327, l='MpServer', x=130.50, y=12.00, z=315.50], qj['Cow'/323486, l='MpServer', x=50.47, y=64.00, z=287.81], qj['Cow'/323487, l='MpServer', x=50.50, y=69.00, z=231.50], qj['Cow'/323480, l='MpServer', x=39.31, y=65.00, z=263.56], qg['Bat'/323482, l='MpServer', x=38.25, y=58.10, z=246.25], qj['Cow'/323483, l='MpServer', x=39.78, y=67.00, z=261.81], sj['Zombie'/509276, l='MpServer', x=29.32, y=48.00, z=275.11], qj['Cow'/323473, l='MpServer', x=47.47, y=62.00, z=226.47], qg['Bat'/323474, l='MpServer', x=40.75, y=51.10, z=251.25], ru['Creeper'/392173, l='MpServer', x=100.50, y=24.00, z=370.50]]
Retry entities: 0 total; []
Stacktrace:
at bdt.a(SourceFile:282)
at net.minecraft.client.Minecraft.b(SourceFile:1881)
at net.minecraft.client.Minecraft.run(SourceFile:540)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 1.5.1
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 167618744 bytes (159 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 5464 (305984 bytes; 0 MB) allocated, 5121 (286776 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
LWJGL: 2.4.2
OpenGL: ~_ERROR~ NullPointerException: null
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2445 (136920 bytes; 0 MB) allocated, 654 (36624 bytes; 0 MB) used[failed to get system properties (java.lang.NullPointerException)]

java.lang.NullPointerException
at org.lwjgl.opengl.GL11.glGetError(GL11.java:1279)
at net.minecraft.client.Minecraft.d(SourceFile:456)
at net.minecraft.client.Minecraft.K(SourceFile:578)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)
— END ERROR REPORT fe0f4cef ----------