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every time i try to join my sisters LAN world (where in the same room) and i keep getting this crash


---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 7/10/12 6:07 PM
Description: Unexpected error

java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at wl.a(SourceFile:805)
at asv.a(SourceFile:821)
at cp.a(SourceFile:135)
at bb.b(SourceFile:333)
at asv.d(SourceFile:81)
at atd.b(SourceFile:51)
at net.minecraft.client.Minecraft.l(SourceFile:1261)
at net.minecraft.client.Minecraft.J(SourceFile:583)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Unknown Source)

Relevant Details:
- Minecraft Version: 1.3.2
- Operating System: Windows Vista (x86) version 6.0
- Java Version: 1.7.0_07, Oracle Corporation
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
- Memory: 390406240 bytes (372 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- LWJGL: 2.4.2
- OpenGL: Intel 965/963 Graphics Media Accelerator GL version 1.5.0 - Build 7.14.10.1437, Intel
- Is Modded: Probably not
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)
- World MpServer Entities: 6 total; [atg['Johnbgood626'/2167, l='MpServer', x=-165.50, y=68.62, z=260.50], no['Bunyip'/1095, l='MpServer', x=-168.50, y=34.00, z=287.50], mo['Chook'/159, l='MpServer', x=-163.53, y=70.00, z=281.41], oa['Bushranger'/173, l='MpServer', x=-158.44, y=22.00, z=272.97], mo['Chook'/182, l='MpServer', x=-146.56, y=68.00, z=272.38], nx['Skeleton'/1691, l='MpServer', x=-145.50, y=42.00, z=270.50]]
- World MpServer Players: 1 total; [atg['Johnbgood626'/2167, l='MpServer', x=-165.50, y=68.62, z=260.50]]
- World MpServer Chunk Stats: MultiplayerChunkCache: 207
- Forced Entities: 7 total; [atg['Johnbgood626'/2167, l='MpServer', x=-165.50, y=68.62, z=260.50], oa['Bushranger'/173, l='MpServer', x=-158.44, y=22.00, z=272.97], mo['Chook'/159, l='MpServer', x=-163.53, y=70.00, z=281.41], no['Bunyip'/1095, l='MpServer', x=-168.50, y=34.00, z=287.50], nj['item.tile.dirt'/2299, l='MpServer', x=-186.49, y=63.25, z=250.88], mo['Chook'/182, l='MpServer', x=-146.56, y=68.00, z=272.38], nx['Skeleton'/1691, l='MpServer', x=-145.50, y=42.00, z=270.50]]
- Retry Entities: 0 total; []