[21:05:32] [Server thread/ERROR]: Couldn't process command: 'playtime'
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:922) ~[?:1.7.0_75]
	at java.util.HashMap$KeyIterator.next(HashMap.java:956) ~[?:1.7.0_75]
	at me.mrkirby153.KCNerfer.playTime.PlayTimeHandler.savePlaytime(PlayTimeHandler.java:39) ~[PlayTimeHandler.class:?]
	at me.mrkirby153.KCNerfer.playTime.PlayTimeHandler.leaderboard(PlayTimeHandler.java:68) ~[PlayTimeHandler.class:?]
	at me.mrkirby153.KCNerfer.command.CommandPlayTime.displayInformation(CommandPlayTime.java:80) ~[CommandPlayTime.class:?]
	at me.mrkirby153.KCNerfer.command.CommandPlayTime.processCommand(CommandPlayTime.java:44) ~[CommandPlayTime.class:?]
	at net.minecraft.command.CommandHandler.executeCommand(CommandHandler.java:96) [CommandHandler.class:?]
	at net.minecraft.network.NetHandlerPlayServer.handleSlashCommand(NetHandlerPlayServer.java:788) [NetHandlerPlayServer.class:?]
	at net.minecraft.network.NetHandlerPlayServer.processChatMessage(NetHandlerPlayServer.java:764) [NetHandlerPlayServer.class:?]
	at net.minecraft.network.play.client.C01PacketChatMessage.processPacket(C01PacketChatMessage.java:47) [C01PacketChatMessage.class:?]
	at net.minecraft.network.play.client.C01PacketChatMessage.processPacket(C01PacketChatMessage.java:68) [C01PacketChatMessage.class:?]
	at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:241) [NetworkManager.class:?]
	at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:182) [NetworkSystem.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:726) [MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:349) [DedicatedServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:614) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:485) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752) [MinecraftServer$2.class:?]