[08:24:38] [Server thread/ERROR]: Could not pass event BlockBreakEvent to ChestShop v3.8.10
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.PlayerInteractManager.breakBlock(PlayerInteractManager.java:264) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.PlayerInteractManager.a(PlayerInteractManager.java:192) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:565) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.PacketPlayInBlockDig.a(PacketPlayInBlockDig.java:41) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.PacketPlayInBlockDig.handle(PacketPlayInBlockDig.java:65) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
Caused by: java.lang.IllegalArgumentException: Name cannot be blank
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88) ~[server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.getOfflinePlayer(CraftServer.java:1395) ~[server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at org.bukkit.Bukkit.getOfflinePlayer(Bukkit.java:436) ~[server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at com.Acrobot.ChestShop.UUIDs.NameManager.getUUID(NameManager.java:84) ~[?:?]
	at com.Acrobot.ChestShop.UUIDs.NameManager.canUseName(NameManager.java:229) ~[?:?]
	at com.Acrobot.ChestShop.Listeners.Block.Break.SignBreak.canDestroyShop(SignBreak.java:150) ~[?:?]
	at com.Acrobot.ChestShop.Listeners.Block.Break.SignBreak.canBlockBeBroken(SignBreak.java:131) ~[?:?]
	at com.Acrobot.ChestShop.Listeners.Block.Break.SignBreak.onSignBreak(SignBreak.java:68) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor80.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:298) ~[server8.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	... 15 more