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java.lang.NullPointerException: Ticking block entity	at net.minecraftforge.items.VanillaInventoryCodeHooks.extractHook(VanillaInventoryCodeHooks.java:45)	at net.minecraft.tileentity.TileEntityHopper.func_145891_a(TileEntityHopper.java:361)	at net.minecraft.tileentity.TileEntityHopper.func_145887_i(TileEntityHopper.java:207)	at net.minecraft.tileentity.TileEntityHopper.func_73660_a(TileEntityHopper.java:187)	at net.minecraft.world.World.func_72939_s(World.java:1802)	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:618)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:709)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)