Here's my problem. I rent 2 servers with the Multicraft panel, both are vanilla servers without mods. Yesterday when we were playing account 1 suddenly had a game crash (crash report) while playing on server A.

Still using account 1 we can start the client and log into server B. With the same computer and same client we succeed log into both worlds/servers with account 2.

We've tried use account 1 on the computer we play with account 2, and get the same crash report. Something happens with the communication between account 1 and the server A.

I can't get rid of the crash report, every time I try to log in my account get verified but the server kicks me out with this error code:
[20:51:08 ERROR]: Game ended with bad state (exit code -1)

I've uninstalled/re-installed the game, stopped the server, deleted the player/user and add it again. According to YouTube I should update my drivers, but they are all up to date. And according to some forum posts it's because of an IP conflict but no matter if I restart modem, router or computer it will fix the problem. I can't find anything abot the "exit code -1" on Google.

In the multicraft log I have this message:
(TranslatableComponent{key='disconnect.genericReason', args=[Internal Exception: java.io.IOException: Connection reset by peer], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}})

The host support want me to test a new world on the same server to see if the error still apears, but I'm a bit worried that I won't get the world up again even with a backup (it usually not working as we've been stupid enough to use å ä and ö in the server name).

Error report
---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 1.7.2014 22:10
Description: Rendering item

java.lang.ArrayIndexOutOfBoundsException: 10
at ako.a(SourceFile:149)
at aci.b_(SourceFile:19)
at adb.j(SourceFile:407)
at add.c(SourceFile:99)
at bny.a(SourceFile:285)
at bny.b(SourceFile:400)
at bbv.a(SourceFile:744)
at bbv.a(SourceFile:123)
at blt.b(SourceFile:834)
at bao.ak(SourceFile:801)
at bao.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)

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

– Head –
Stacktrace:
at ako.a(SourceFile:149)
at aci.b_(SourceFile:19)
at adb.j(SourceFile:407)
at add.c(SourceFile:99)
at bny.a(SourceFile:285)

– Item being rendered –
Details:
Item Type: aci@19d0d20
Item Aux: 10
Item NBT: null
Item Foil: false
Stacktrace:
at bny.b(SourceFile:400)
at bbv.a(SourceFile:744)
at bbv.a(SourceFile:123)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bjk['AquaVera'/97665, l='MpServer', x=-483,06, y=79,62, z=-54,03]]
Chunk stats: MultiplayerChunkCache: 5, 5
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-232,64,128), Chunk: (at 8,4,0 in -15,8; contains blocks -240,0,128 to -225,255,143), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 184782794 game time, 186105680 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: 3 total; [bjk['AquaVera'/97665, l='MpServer', x=-483,06, y=79,62, z=-54,03], wp['Sheep'/97862, l='MpServer', x=-467,13, y=76,00, z=-57,81], wp['Sheep'/97861, l='MpServer', x=-468,91, y=76,00, z=-60,91]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at bjf.a(SourceFile:289)
at bao.b(SourceFile:1972)
at bao.f(SourceFile:737)
at net.minecraft.client.main.Main.main(SourceFile:148)

– System Details –
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 35326960 bytes (33 MB) / 92168192 bytes (87 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.10
LWJGL: 2.9.1
OpenGL: GeForce 8500 GT/PCIe/SSE2 GL version 3.3.0, 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: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)