I was joining a server(ip is Nebulix.vix.com)and then i crashed,i don't have much to say.

Thank you for your report.
However, your ticket has been resolved as incomplete.

We are unable to diagnose your issue due to the lack of proper debug information. Please review the guidelines before reporting issues.
In case of a game crash, please also attach the crash log from [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder].

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Go and try doing this your self and tell me what happends

Crash Report
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Minecraft Crash Report ----
// Why did you do that?

Time: 2/20/15 4:11 PM
Description: Updating screen events

java.lang.IllegalArgumentException: java.text.ParseException: A prohibited code point was found in the input?nebulix
at java.net.IDN.toASCIIInternal(IDN.java:243)
at java.net.IDN.toASCII(IDN.java:101)
at java.net.IDN.toASCII(IDN.java:127)
at cev.a(SourceFile:21)
at bwb.<init>(SourceFile:38)
at bzp.a(SourceFile:313)
at bzp.f(SourceFile:305)
at bzs.a(SourceFile:243)
at buu.b(SourceFile:41)
at bzp.a(SourceFile:344)
at bxf.k(SourceFile:405)
at bzp.k(SourceFile:85)
at bxf.p(SourceFile:382)
at bsu.r(SourceFile:1473)
at bsu.as(SourceFile:877)
at bsu.a(SourceFile:314)
at net.minecraft.client.main.Main.main(SourceFile:120)
Caused by: java.text.ParseException: A prohibited code point was found in the input?nebulix
at sun.net.idn.StringPrep.prepare(StringPrep.java:430)
at java.net.IDN.toASCIIInternal(IDN.java:241)
... 16 more

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

– Head –
Stacktrace:
at java.net.IDN.toASCIIInternal(IDN.java:243)
at java.net.IDN.toASCII(IDN.java:101)
at java.net.IDN.toASCII(IDN.java:127)
at cev.a(SourceFile:21)
at bwb.<init>(SourceFile:38)
at bzp.a(SourceFile:313)
at bzp.f(SourceFile:305)
at bzs.a(SourceFile:243)
at buu.b(SourceFile:41)
at bzp.a(SourceFile:344)
at bxf.k(SourceFile:405)
at bzp.k(SourceFile:85)
at bxf.p(SourceFile:382)

– Affected screen –
Details:
Screen name: bzp
Stacktrace:
at bsu.r(SourceFile:1473)
at bsu.as(SourceFile:877)
at bsu.a(SourceFile:314)
at net.minecraft.client.main.Main.main(SourceFile:120)

– System Details –
Details:
Minecraft Version: 1.8
Operating System: Mac OS X (x86_64) version 10.7.5
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 165128480 bytes (157 MB) / 228777984 bytes (218 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8
LWJGL: 2.9.2
OpenGL: NVIDIA GeForce 9400 OpenGL Engine GL version 2.1 NVIDIA-7.32.12, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object 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: No
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)

The server is modified, ask them to fix it.

Modifed?You mean it has mods?

Ok...so what happended to you?

You just joined or..?

You gave 2 hostnames, both of which don't respond to any client requests.

Nebula.vix.com and Nebulix.vix.com are both invalid.

Oops i meant to put Nebulix

So should i delete this thing or no?