[19:49:18] [Server thread/ERROR]: Could not pass event InventoryCloseEvent to ChestProtection v1.0
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.handleInventoryCloseEvent(CraftEventFactory.java:838) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1384) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.PacketPlayInCloseWindow.a(PacketPlayInCloseWindow.java:18) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.PacketPlayInCloseWindow.a(PacketPlayInCloseWindow.java:1) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_45]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_45]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SystemUtils.java:19) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:718) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_8_R3.block.CraftBlockState cannot be cast to org.bukkit.block.Sign
	at me.st28.bigunmanol.chestprotection.backend.ProtectionManager.removeShop(ProtectionManager.java:866) ~[?:?]
	at me.st28.bigunmanol.chestprotection.backend.ShopCreateGUI.handleClose(ShopCreateGUI.java:242) ~[?:?]
	at me.st28.bigunmanol.chestprotection.gui.GUIManager.onInventoryClose(GUIManager.java:43) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor324.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_45]
	at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_45]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
	... 16 more