java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at refinedstorage.apiimpl.storage.NBTStorage.writeToNBT(NBTStorage.java:89)
at refinedstorage.tile.TileDiskDrive.write(TileDiskDrive.java:181)
at refinedstorage.tile.TileBase.func_189515_b(TileBase.java:121)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75820_a(AnvilChunkLoader.java:384)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75816_a(AnvilChunkLoader.java:175)
at net.minecraft.world.gen.ChunkProviderServer.func_73242_b(ChunkProviderServer.java:202)
at net.minecraft.world.gen.ChunkProviderServer.func_186027_a(ChunkProviderServer.java:230)
at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.java:355)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:636)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)

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