[12:08:48] [Server thread/INFO]: tachohentai issued server command: /d unall
[12:08:48] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'd' in plugin iDisguise v2.3.1
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1304.jar:git-Spigot-1304]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:199) ~[spigot-1304.jar:git-Spigot-1304]
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServer.java:547) ~[spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.PlayerConnection.handleCommand(PlayerConnection.java:962) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:817) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat.java:65) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.ServerConnection.c(ServerConnection.java:77) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:698) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:560) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:467) [spigot-1304.jar:git-Spigot-1304]
	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [spigot-1304.jar:git-Spigot-1304]
Caused by: java.util.ConcurrentModificationException
	at java.util.Hashtable$Enumerator.next(Unknown Source) ~[?:1.7.0_25]
	at de.robingrether.idisguise.management.DisguiseManager.undisguiseAll(DisguiseManager.java:122) ~[?:?]
	at de.robingrether.idisguise.iDisguise.onCommand(iDisguise.java:286) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1304.jar:git-Spigot-1304]
	... 13 more