I Dont now does it happens on over linux OS or windows but it happens to me
---- Minecraft Crash Report ----
// There are four lights!

Time: 3/6/14 2:26 PM
Description: Exception in server tick loop

java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:27)
at pe.a(SourceFile:60)
at pe.a(SourceFile:110)
at my.aF(SourceFile:421)
at my.g(SourceFile:145)
at net.minecraft.server.MinecraftServer.run(SourceFile:367)
at mp.run(SourceFile:667)

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

– System Details –
Details:
Minecraft Version: 14w10b
Operating System: Linux (i386) version 2.6.32-11-pve
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) Server VM (mixed mode), Oracle Corporation
Memory: 1918695928 bytes (1829 MB) / 2058354688 bytes (1963 MB) up to 2058354688 bytes (1963 MB)
JVM Flags: 2 total; -Xmx2G -Xms2G
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Is Modded: Unknown (can't tell)
Type: Dedicated Server (map_server.txt)