I report a similar error when trying to pick up an empty burner miner. Results in a crash-to-main-menu for me. Here's the error text:
Error while running event ammo-loader::on_pre_player_mined_item (ID 11)
LuaItemStack API call when LuaItemStack was invalid.
stack traceback:
ammo-loader/lib/HiddenInserter.lua:233: in function 'giveHeld'
ammo-loader/lib/HiddenInserter.lua:248: in function 'destroy'
ammo-loader/lib/TrackedSlot.lua:292: in function 'destroy'
ammo-loader/control.lua:188: in function <ammo-loader/control.lua:169>
(...tail calls...)
Whatever you did patch-before-last fixed the Factorissimo issue I had earlier, though! Thanks! :-)