Hello,
I get crashes while loading a savefile with the following mods:
Construction_Drones_0.5.1
FluidMustFlow_1.2.7
FNEI_0.3.0
Krastorio2_0.9.11
Mining_Drones_0.3.19
road-grid_0.0.3
rso-mod_6.0.8
Transport_Drones_0.5.10
VehicleSnap_1.18.1

Factorio version 0.18.21

The error message is the following:

Error while running event Transport_Drones::on_configuration_changed
Transport_Drones/script/depot_common.lua:133: attempt to index local 'node' (a nil value)
stack traceback:
Transport_Drones/script/depot_common.lua:133: in function 'add_depot_to_node'
Transport_Drones/script/depot_common.lua:381: in function 'on_configuration_changed'
core/lualib/event_handler.lua:87: in function <core/lualib/event_handler.lua:84>

This is the savefile: https://drive.google.com/open?id=15BgJrggTuXn0npcFRrfi5plxvAhu8sSS

Thanks for the report,

The road grid was throwing off a coding assumption when recalculating the network,
Should be fixed now

Everything works fine so now I can start the weekend :)
Thank you very much!