java.lang.NullPointerException: Exception while ticking a block

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java.lang.NullPointerException: Exception while ticking a block
at vazkii.botania.common.block.tile.TileCraftCrate.onWanded(
at vazkii.botania.common.block.BlockOpenCrate.onUsedByWand(
at vazkii.botania.common.block.dispenser.BehaviourWand.func_82487_b(
at net.minecraft.dispenser.BehaviorDefaultDispenseItem.func_82482_a(SourceFile:12)
at net.minecraft.block.BlockDispenser.func_176439_d(SourceFile:121)
at net.minecraft.block.BlockDispenser.func_180650_b(SourceFile:147)
at net.minecraft.server.MinecraftServer.func_71190_q(
at net.minecraft.server.MinecraftServer.func_71217_p(
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(

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