cloudtrade error

[03:48:24] [Server thread/ERROR]: Could not pass event InventoryClickEvent to CloudTrade v1.5
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:299) ~[custom.jar:git-Spigot-1571]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[custom.jar:git-Spigot-1571]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [custom.jar:git-Spigot-1571]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:1428) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.a(SourceFile:32) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.handle(SourceFile:10) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:184) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:731) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [custom.jar:git-Spigot-1571]
	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [custom.jar:git-Spigot-1571]
Caused by: java.lang.NullPointerException
	at com.solarcloud7.cloudtrade.TradeChestLayout.updateStatusBlock(TradeChestLayout.java:116) ~[?:?]
	at com.solarcloud7.cloudtrade.TradeManager.onItemAccept(TradeManager.java:116) ~[?:?]
	at com.solarcloud7.cloudtrade.InventoryListener.onInventoryClick(InventoryListener.java:89) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor329.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_60]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_60]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296) ~[custom.jar:git-Spigot-1571]
	... 13 more