Crash when pipetting ag tower in compact view

[gdgrant]

Problem Description

When I click an ag tower in compact view to put it into my cursor, the game crashes with the following message:

The mod Factory Planner (2.0.16) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event factoryplanner::on_gui_click (ID 1)
__factoryplanner__/util/cursor.lua:38: attempt to concatenate field 'prototype_category' (a nil value)
stack traceback:
	__factoryplanner__/util/cursor.lua:38: in function 'set_entity'
	__factoryplanner__/ui/base/compact_dialog.lua:496: in function 'handler'
	__factoryplanner__/ui/event_handler.lua:169: in function <__factoryplanner__/ui/event_handler.lua:121>

Here's the save: Factory Planner Crash.zip
And the log: factorio-current.log

Reproduction

1. Start a new game
2. Create a new factory planner district and set it to Gleba
3. Make a factory to make a bio product, e.g. yumako, such that an ag tower is used in the factory
4. Change to compact view
5. Click on the ag tower icon
6. Factory Planner suffers a non-recoverable error