Problem/Bug Crash on command '/home'

Sometimes, this error happens when you type the command '/home':

Code:

2015-07-11 18:10:25 [INFO] xboy_ issued server command: /home acro
2015-07-11 18:10:25 [SEVERE] java.util.ConcurrentModificationException
2015-07-11 18:10:25 [SEVERE]    at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
2015-07-11 18:10:25 [SEVERE]    at java.util.HashMap$KeyIterator.next(Unknown Source)
2015-07-11 18:10:25 [SEVERE]    at net.minecraft.server.v1_5_R3.EntityTracker.updatePlayers(EntityTracker.java:151)
2015-07-11 18:10:25 [SEVERE]    at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:572)
2015-07-11 18:10:25 [SEVERE]    at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
2015-07-11 18:10:25 [SEVERE]    at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
2015-07-11 18:10:25 [SEVERE]    at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
2015-07-11 18:10:25 [SEVERE]    at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
2015-07-11 18:10:25 [SEVERE] Encountered an unexpected exception ConcurrentModificationException
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
        at java.util.HashMap$KeyIterator.next(Unknown Source)
        at net.minecraft.server.v1_5_R3.EntityTracker.updatePlayers(EntityTracker.java:151)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:572)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)

I'm using MultiHome plugin

Thanks in advance.

 

It is a core, fundamental plugin error at the authorship level - aka, only the plugin author can fix this, it has nothing to do with you. Author is not properly doing the task required in code, and the plugin internally breaks under the right circumstances

The fact that you are using probabably the oldest plugin you could possibly find would also be a factor - there have been numerous core changes to minecraft code since the 1.2.5 version days, and most likely the mechanism of teleporting and updating the records are touching code that has been modified in the server core, so..pftttbang blows up.