[15:29:51] [Server thread/ERROR]: Could not pass event StructureGrowEvent to Umbaska v2.0 Beta 5.052
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[custom.jar:git-Spigot-db6de12-930a59c]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[custom.jar:git-Spigot-db6de12-930a59c]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [custom.jar:git-Spigot-db6de12-930a59c]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [custom.jar:git-Spigot-db6de12-930a59c]
	at net.minecraft.server.v1_8_R3.BlockSapling.b(BlockSapling.java:51) [custom.jar:git-Spigot-db6de12-930a59c]
	at net.minecraft.server.v1_8_R3.Block.a(Block.java:299) [custom.jar:git-Spigot-db6de12-930a59c]
	at net.minecraft.server.v1_8_R3.WorldServer.h(WorldServer.java:495) [custom.jar:git-Spigot-db6de12-930a59c]
	at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:253) [custom.jar:git-Spigot-db6de12-930a59c]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:770) [custom.jar:git-Spigot-db6de12-930a59c]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [custom.jar:git-Spigot-db6de12-930a59c]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [custom.jar:git-Spigot-db6de12-930a59c]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [custom.jar:git-Spigot-db6de12-930a59c]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_72]
Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:653) ~[?:1.8.0_72]
	at java.util.ArrayList.get(ArrayList.java:429) ~[?:1.8.0_72]
	at uk.co.umbaska.Misc.CropGrowEvent.onTreeGrow(CropGrowEvent.java:12) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor746.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_72]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_72]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[custom.jar:git-Spigot-db6de12-930a59c]
	... 12 more