[20:07:38] [Server thread/ERROR]: Could not pass event PlayerInteractEvent to ChestShop v3.8.12
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:227) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at net.minecraft.server.v1_8_R3.PlayerInteractManager.interact(PlayerInteractManager.java:463) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:736) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_31]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_31]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SystemUtils.java:19) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:718) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_31]
Caused by: java.lang.IllegalArgumentException: Name cannot be blank
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:125) ~[server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.getOfflinePlayer(CraftServer.java:1291) ~[server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at org.bukkit.Bukkit.getOfflinePlayer(Bukkit.java:744) ~[server8.jar:git-Spigot-3ccbe77-a6a57a9]
	at com.Acrobot.ChestShop.UUIDs.NameManager.getUUID(NameManager.java:84) ~[?:?]
	at com.Acrobot.ChestShop.UUIDs.NameManager.canUseName(NameManager.java:230) ~[?:?]
	at com.Acrobot.ChestShop.Plugins.ChestShop.isShopMember(ChestShop.java:70) ~[?:?]
	at com.Acrobot.ChestShop.Plugins.ChestShop.canAccess(ChestShop.java:57) ~[?:?]
	at com.Acrobot.ChestShop.Listeners.Player.PlayerInteract.onInteract(PlayerInteract.java:63) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor116.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_31]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_31]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[server8.jar:git-Spigot-3ccbe77-a6a57a9]
	... 17 more