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(TileCraftCrate.java:190)
at vazkii.botania.common.block.BlockOpenCrate.onUsedByWand(BlockOpenCrate.java:153)
at vazkii.botania.common.block.dispenser.BehaviourWand.func_82487_b(BehaviourWand.java:35)
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.world.WorldServer.func_72955_a(WorldServer.java:742)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:698)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:149)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
at java.lang.Thread.run(Thread.java:745)

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