[12:29:38] [Server thread/ERROR]: Could not pass event PlayerInteractEvent to ChestShop v3.7.17
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-1627]
	at org.bukkit.craftbukkit.v1_7_R4.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:242) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.PlayerInteractManager.dig(PlayerInteractManager.java:103) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:552) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.PacketPlayInBlockDig.a(SourceFile:53) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.PacketPlayInBlockDig.handle(SourceFile:8) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:184) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1627]
Caused by: java.lang.IllegalArgumentException: value already present: b2cf56cd-3be9-3209-8f7c-454ab53b39e8
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:115) ~[spigot.jar:git-Spigot-1627]
	at com.google.common.collect.AbstractBiMap.putInBothMaps(AbstractBiMap.java:112) ~[spigot.jar:git-Spigot-1627]
	at com.google.common.collect.AbstractBiMap.put(AbstractBiMap.java:96) ~[spigot.jar:git-Spigot-1627]
	at com.google.common.collect.HashBiMap.put(HashBiMap.java:85) ~[spigot.jar:git-Spigot-1627]
	at com.Acrobot.ChestShop.UUIDs.NameManager.getUUID(NameManager.java:55) ~[?:?]
	at com.Acrobot.ChestShop.Listeners.Player.PlayerInteract.preparePreTransactionEvent(PlayerInteract.java:121) ~[?:?]
	at com.Acrobot.ChestShop.Listeners.Player.PlayerInteract.onInteract(PlayerInteract.java:98) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor174.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_20]
	at java.lang.reflect.Method.invoke(Method.java:483) ~[?:1.8.0_20]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot.jar:git-Spigot-1627]
	... 15 more