Program: 169203
Project: 169203
Buggy source:
protected void bindToNetworkTool(final InventoryPlayer playerInventory,final DimensionalCoord partLocation,final int slotOffsetX,final int slotOffsetY){
  for (int slotIndex=0; slotIndex < playerInventory.getSizeInventory(); slotIndex++) {
    ItemStack stack=playerInventory.getStackInSlot(slotIndex);
    if ((stack != null) && (stack.isItemEqual(AEApi.instance().definitions().items().networkTool().maybeStack(1).get()))) {
      IGuiItem guiItem=(IGuiItem)stack.getItem();
      INetworkTool networkTool=(INetworkTool)guiItem.getGuiObject(stack,partLocation.getWorld(),partLocation.x,partLocation.y,partLocation.z);
      Slot toolSlot=null;
      for (int column=0; column < ContainerWithNetworkTool.TOOL_COLUMNS; column++) {
        for (int row=0; row < ContainerWithNetworkTool.TOOL_ROWS; row++) {
          int slotToolIndex=column + (row * ContainerWithNetworkTool.TOOL_COLUMNS);
          toolSlot=new SlotNetworkTool(networkTool,slotToolIndex,ContainerWithNetworkTool.TOOL_SLOT_X_OFFSET + slotOffsetX + (column * ContainerWithPlayerInventory.SLOT_SIZE),(row * ContainerWithPlayerInventory.SLOT_SIZE) + ContainerWithNetworkTool.TOOL_SLOT_Y_OFFSET + slotOffsetY);
          this.addSlotToContainer(toolSlot);
          if (slotToolIndex == 0) {
            this.firstToolSlotNumber=toolSlot.slotNumber;
          }
        }
      }
      if (toolSlot != null) {
        this.lastToolSlotNumber=toolSlot.slotNumber;
      }
      this.hasNetworkTool=true;
      return;
    }
  }
}

Fixed version (ground truth):
protected void bindToNetworkTool(final InventoryPlayer playerInventory,final DimensionalCoord partLocation,final int slotOffsetX,final int slotOffsetY){
  ItemStack nwTool=AEApi.instance().definitions().items().networkTool().maybeStack(1).orNull();
  if (nwTool != null) {
    for (int slotIndex=0; slotIndex < playerInventory.getSizeInventory(); slotIndex++) {
      ItemStack stack=playerInventory.getStackInSlot(slotIndex);
      if ((stack != null) && (stack.isItemEqual(AEApi.instance().definitions().items().networkTool().maybeStack(1).get()))) {
        IGuiItem guiItem=(IGuiItem)stack.getItem();
        INetworkTool networkTool=(INetworkTool)guiItem.getGuiObject(stack,partLocation.getWorld(),partLocation.x,partLocation.y,partLocation.z);
        Slot toolSlot=null;
        for (int column=0; column < ContainerWithNetworkTool.TOOL_COLUMNS; column++) {
          for (int row=0; row < ContainerWithNetworkTool.TOOL_ROWS; row++) {
            int slotToolIndex=column + (row * ContainerWithNetworkTool.TOOL_COLUMNS);
            toolSlot=new SlotNetworkTool(networkTool,slotToolIndex,ContainerWithNetworkTool.TOOL_SLOT_X_OFFSET + slotOffsetX + (column * ContainerWithPlayerInventory.SLOT_SIZE),(row * ContainerWithPlayerInventory.SLOT_SIZE) + ContainerWithNetworkTool.TOOL_SLOT_Y_OFFSET + slotOffsetY);
            this.addSlotToContainer(toolSlot);
            if (slotToolIndex == 0) {
              this.firstToolSlotNumber=toolSlot.slotNumber;
            }
          }
        }
        if (toolSlot != null) {
          this.lastToolSlotNumber=toolSlot.slotNumber;
        }
        this.hasNetworkTool=true;
        return;
      }
    }
  }
}