See https://mods.factorio.com/mod/SpidertronPatrols

When clicking on a Vehicle Dock while a vehicle is docked (e.g. a spidertron):

The mod Filter Helper (0.2.12) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event FilterHelper::on_gui_opened (ID 98)
LuaInventory API call when LuaInventory was invalid.
stack traceback:
[C]: in function 'index'
__FilterHelper/filter_updaters.lua:19: in function 'condition'
FilterHelper/filter_updaters.lua:286: in function 'get_filter_updater'
FilterHelper/control.lua:496: in function 'update_ui'
FilterHelper/control.lua:555: in function <FilterHelper/control.lua:550>

maybe https://github.com/MESLewis/FilterHelper/pull/18

at least when I apply those changes in the mod's zip, the error isn't raised - however, I have no clue at all whether this leads to unintended sideeffects or subsequent errors. I'll play a while with these changes and see where it leads me, until it's "officially" fixed...