Unable to shift-click drones into an Indexer

Ingame, nothing happens when I try to shift-click a stack of drones into the Indexer.
The console outputs this:
2014-01-07 22:13:28 [INFO] [STDERR] java.lang.NullPointerException
2014-01-07 22:13:28 [INFO] [STDERR]     at binnie.core.machines.transfer.TransferRequest.transfer(TransferRequest.java:111)
2014-01-07 22:13:28 [INFO] [STDERR]     at binnie.craftgui.minecraft.ContainerCraftGUI.onMouseOverSlot(ContainerCraftGUI.java:368)
2014-01-07 22:13:28 [INFO] [STDERR]     at binnie.craftgui.minecraft.ContainerCraftGUI.handleNBT(ContainerCraftGUI.java:195)
2014-01-07 22:13:28 [INFO] [STDERR]     at binnie.craftgui.minecraft.ContainerCraftGUI.recieveNBT(ContainerCraftGUI.java:173)
2014-01-07 22:13:28 [INFO] [STDERR]     at binnie.core.network.BinnieCorePacketID.onPacketData(BinnieCorePacketID.java:79)
2014-01-07 22:13:28 [INFO] [STDERR]     at binnie.core.network.BinniePacketHandler.onPacketData(BinniePacketHandler.java:39)
2014-01-07 22:13:28 [INFO] [STDERR]     at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255)
2014-01-07 22:13:28 [INFO] [STDERR]     at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245)
2014-01-07 22:13:28 [INFO] [STDERR]     at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:85)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.network.NetServerHandler.func_72501_a(NetServerHandler.java:1130)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:61)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:276)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
2014-01-07 22:13:28 [INFO] [STDERR]     at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
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