Server crashing

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 3/7/14 4:23 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:
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– System Details –
Details:
Minecraft Version: 14w10c
Operating System: FreeBSD (i386) version 8.1-RELEASE
Java Version: 1.6.0_32, Sun Microsystems Inc.
Java VM Version: OpenJDK Client VM (mixed mode), Sun Microsystems Inc.
Memory: 9748344 bytes (9 MB) / 16252928 bytes (15 MB) up to 259522560 bytes (247 MB)
JVM Flags: 0 total;
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)