java.lang.ArrayIndexOutOfBoundsException: 18

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java.lang.ArrayIndexOutOfBoundsException: 18
at net.minecraft.server.v1_9_R2.Chunk.getBrightness(
at org.bukkit.craftbukkit.v1_9_R2.block.CraftBlock.getLightFromSky(
at com.extrahardmode.task.MoreMonstersTask.verifyLocation(
at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftScheduler.mainThreadHeartbeat(
at net.minecraft.server.v1_9_R2.MinecraftServer.D(
at net.minecraft.server.v1_9_R2.DedicatedServer.D(
at net.minecraft.server.v1_9_R2.MinecraftServer.C(

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